Sources
Every source we cite, by tool and page: what we use it for, a short passage where we can show one, the address and the dates we checked it.
What do Current and Re-checking mean?
Current means the source is within its check period. Re-checking means its next check date has passed. Each status is set when the page is built and is updated in your browser if a date passes before we next update the site. A source past its next check date must be read again before we can next update the site.
How we size explains how long each answer is valid.
Bed and mattress sizes
-
- Source
- National Bed Federation, Bed Advice UK size guide (external site)
- Used for
- Bed sizes: the six UK sizes and the length rule for tall sleepers
- Quote
Small double beds are also known as a ‘Queen size bed’ or ‘Three quarter’.
- URL
- https://bedadvice.co.uk/beds-and-beyond/bed-sizes-uk-bed-and-mattress-size-guide/
- Checked
- Next check
- Status
- Current
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- Source
- Dreams mattress size guide (external site)
- Used for
- Bed sizes: the inch figures, emperor and Euro sizes, and what queen means
- Quote
if you have a European-sized frame, check its measurements carefully; a UK king will be 10cm narrower.
- URL
- https://www.dreams.co.uk/bed-mattress-guide/the-mattress-size-guide
- Checked
- Next check
- Status
- Current
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- Source
- Silentnight size guide (external site)
- Used for
- Bed sizes: how to measure a mattress, and a cross-check of the UK sizes
- Quote
We recommend you always measure in a straight line, remove any bedding prior for accurate results, and round up to the nearest measurement.
- URL
- https://www.silentnight.co.uk/guides/bed-mattress-size-guide
- Checked
- Next check
- Status
- Current
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- Source
- Tempur UK bed sizes (external site)
- Used for
- Bed sizes: a cross-check of the UK sizes, and emperor and Euro sizes
- Quote
The largest of all of our special sizes, an Emperor mattress gives those with large bedrooms the maximum amount of sleeping space, so if you share you both have room to spread out and relax.
- URL
- https://uk.tempur.com/beds-83071412.html
- Checked
- Next check
- Status
- Current
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- Source
- Silentnight, Comfort Breathe 1000 product page (external site)
- Used for
- Bed sizes: the maker's mattress sizes on the product cards
- Quote
Double
/135cm
/190cm
/24cm
(a row of the maker's size table)- URL
- https://www.silentnight.co.uk/silentnight-comfort-breathe-1000-pocket-mattress.html
- Checked
- Next check
- Status
- Current
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- Source
- Emma, Original Mattress single size page (external site)
- Used for
- Bed sizes: the maker's single mattress size on its product card
- Quote
UK Single 3'0 x 6'3 (90 x 190cm)
(a row of the maker's size table)- URL
- https://www.emma-sleep.co.uk/mattresses/emma-original-mattress/sku-EMAOH090190AAE/
- Checked
- Next check
- Status
- Current
-
- Source
- Emma, Original Mattress double size page (external site)
- Used for
- Bed sizes: the maker's double mattress size on its product card
- Quote
UK Double 4'6 x 6'3 (135x190cm)
(a row of the maker's size table)- URL
- https://www.emma-sleep.co.uk/mattresses/emma-original-mattress/sku-EMAOH135190AAE/
- Checked
- Next check
- Status
- Current
-
- Source
- Emma, Original Mattress king size page (external site)
- Used for
- Bed sizes: the maker's king mattress size on its product card
- Quote
UK King 5'0 x 6'7 (150x200cm)
(a row of the maker's size table)- URL
- https://www.emma-sleep.co.uk/mattresses/emma-original-mattress/sku-EMAOH150200AAE/
- Checked
- Next check
- Status
- Current
-
- Source
- National Bed Federation, Bed Advice UK questions (external site)
- Used for
- Bed sizes: why size names alone can mislead
- Quote
one shop’s king size may not be exactly the same as another’s!
- URL
- https://bedadvice.co.uk/faqs/
- Checked
- Next check
- Status
- Current
TV size
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- Source
- ITU-R Recommendation BT.500-15 (Word document, external site) (Word document)
- Used for
- TV size: the optimal viewing distance for each picture resolution
- Quote
The design viewing distance (DVD), or optimal viewing distance, for a digital system is the distance at which two adjacent pixels subtend an angle of 1 arc-min at the viewer’s eye;
- URL
- https://www.itu.int/dms_pubrec/itu-r/rec/bt/R-REC-BT.500-15-202305-I!!MSW-E.docx
- Checked
- Next check
- Status
- Current
-
- Source
- ITU-R Recommendation BT.1845-1 (Word document, external site) (Word document)
- Used for
- TV size: the typical limit of human sight
- Quote
the typical value of the minimum angular resolution of human vision in both the vertical and horizontal directions is 1 arc-min, which corresponds to the ability to discriminate detail that subtends an angle of 1 arc-min at the viewer’s eye
- URL
- https://www.itu.int/dms_pubrec/itu-r/rec/bt/R-REC-BT.1845-1-201003-I!!MSW-E.docx
- Checked
- Next check
- Status
- Current
-
- Source
- LG UK, TV size guide (external site)
- Used for
- TV size: LG's recommended screen size for a seat
- Quote
simply divide the viewing distance (in inches) by 1.2 to find the recommended screen size.
- URL
- https://www.lg.com/uk/tvs-soundbars/tv-buying-guide/tv-size/
- Checked
- Next check
- Status
- Current
-
- Source
- LG UK, how to measure TV sizes (external site)
- Used for
- TV size: how LG measures a screen, and its other distance rules
- Quote
If you have a Full HD TV, then one popular rule is to simply use 4.2cm of viewing distance for every inch of the diagonal screen size.
- URL
- https://www.lg.com/uk/lg-experience/helpful-hints/how-to-measure-and-read-tv-sizes/
- Checked
- Next check
- Status
- Current
-
- Source
- LG UK, 43NU800B6LC product page (external site)
- Used for
- TV size: the maker's screen size on its product card
- Quote
43NU800B6LC 43 inch LG NANO 4K UHD AI NU80 Smart TV 2026
- URL
- https://www.lg.com/uk/tvs-soundbars/nano-4k-uhd/43nu800b6lc/
- Checked
- Next check
- Status
- Current
-
- Source
- LG UK, 50NU800B6LC product page (external site)
- Used for
- TV size: the maker's screen size on its product card
- Quote
50NU800B6LC 50 inch LG NANO 4K UHD AI NU80 Smart TV 2026
- URL
- https://www.lg.com/uk/tvs-soundbars/nano-4k-uhd/50nu800b6lc/
- Checked
- Next check
- Status
- Current
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- Source
- LG UK, 55NU800B6LA product page (external site)
- Used for
- TV size: the maker's screen size on its product card
- Quote
55NU800B6LA 55 inch LG NANO 4K UHD AI NU80 Smart TV 2026
- URL
- https://www.lg.com/uk/tvs-soundbars/nano-4k-uhd/55nu800b6la/
- Checked
- Next check
- Status
- Current
-
- Source
- LG UK, 65NU800B6LA product page (external site)
- Used for
- TV size: the maker's screen size on its product card
- Quote
65NU800B6LA 65 inch LG NANO 4K UHD AI NU80 Smart TV 2026
- URL
- https://www.lg.com/uk/tvs-soundbars/nano-4k-uhd/65nu800b6la/
- Checked
- Next check
- Status
- Current
Kids' bike size
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- Source
- Islabikes size chart (external site)
- Used for
- Kids' bikes: Islabikes' inside leg and height limits for each model
- Quote
Our minimum requirements for each model are ‘absolute’ so the rider must meet both height and inside leg minimums for a safe and comfortable fit.
- URL
- https://www.islabikes.co.uk/how-to-guides/islabikes-size-chart
- Checked
- Next check
- Status
- Current
-
- Source
- woom inseam table (external site)
- Used for
- Kids' bikes: woom's inside leg and height limits for each model
- Quote
Take a hardback book and place the spine of the book, facing upward, at your child's crotch with the same slight pressure that you'd get on the saddle while riding.
- URL
- https://mediahub.woom.com/m/2cf6e45a2adff814/original/woom-Innenbeinlange-Tabelle-DIN-A4-SCREEN-300-DPI-SRGB-EN.pdf
- Checked
- Next check
- Status
- Current
-
- Source
- Islabikes Cnoc spec sheet (external site)
- Used for
- Kids' bikes: the wheel size of each current Cnoc
- Quote
Islabikes Mixte, 14" x 1.3 (33-254)
/Islabikes Mixte, 16" x 16x1.35 (34-305)
/Islabikes Mixte, 18" x 1.4 (35-355)
(a row of the maker's size table)- URL
- https://www.islabikes.co.uk/Documents/Bike/cnoc-16-spec-sheet-2025.pdf
- Checked
- Next check
- Status
- Current
-
- Source
- woom UK size page (external site)
- Used for
- Kids' bikes: woom's wheel sizes and its advice on choosing a size
- Quote
Whenever possible, arrange a test ride for the bike you're considering for your child.
- URL
- https://woom.com/en_GB/find-the-right-bike-size
- Checked
- Next check
- Status
- Current
-
- Source
- woom UK product page, woom GO 4 (external site)
- Used for
- Kids' bikes: the woom GO 4's wheel size
- URL
- https://woom.com/en_GB/bikes/go-4
- Checked
- Next check
- Status
- Current
-
- Source
- woom UK product page, woom GO 3 AUTOMAGIC (external site)
- Used for
- Kids' bikes: the woom GO 3 AUTOMAGIC's wheel size
- URL
- https://woom.com/en_GB/bikes/go-3-automagic
- Checked
- Next check
- Status
- Current
-
- Source
- woom UK product page, woom EXPLORE 5 (external site)
- Used for
- Kids' bikes: the woom EXPLORE 5's wheel size
- URL
- https://woom.com/en_GB/bikes/explore-5
- Checked
- Next check
- Status
- Current
-
- Source
- woom UK product page, woom EXPLORE 4 (external site)
- Used for
- Kids' bikes: the woom EXPLORE 4's wheel size
- URL
- https://woom.com/en_GB/bikes/explore-4
- Checked
- Next check
- Status
- Current
-
- Source
- woom UK product page, woom EXPLORE 6 (external site)
- Used for
- Kids' bikes: the woom EXPLORE 6's wheel size
- URL
- https://woom.com/en_GB/bikes/explore-6
- Checked
- Next check
- Status
- Current
-
- Source
- Cycling UK, the right size bike for a child (external site)
- Used for
- Kids' bikes: Cycling UK's rule of thumb and buying advice
- Quote
They will be able to ride bikes with wheels the next size down and on some brands will fit a bike with wheels the next size up.
- URL
- https://www.cyclinguk.org/article/cycling-guide/right-size-bike-child
- Checked
- Next check
- Status
- Current
Privacy, disclosure and other site pages
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- Source
- CAP Code, recognition of marketing communications (external site)
- Used for
- Affiliate disclosure: why adverts must be identifiable
- Quote
Marketing communications must be obviously identifiable as such.
- URL
- https://www.asa.org.uk/type/non_broadcast/code_section/02.html
- Checked
- Next check
- Status
- Current
-
- Source
- ASA, affiliate marketing advice (external site)
- Used for
- Affiliate disclosure: why affiliate links must be identifiable
- Quote
content related to affiliated products (and the links themselves) should be identifiable as advertising
- URL
- https://www.asa.org.uk/advice-online/affiliate-marketing.html
- Checked
- Next check
- Status
- Current
-
- Source
- ICO, cookies and similar technologies (external site)
- Used for
- Privacy: the rules on storing anything on your device
- Quote
The same rules also apply if you use any other type of technology to store or gain access to information on someone’s device.
- URL
- https://ico.org.uk/for-organisations/direct-marketing-and-privacy-and-electronic-communications/guide-to-pecr/cookies-and-similar-technologies/
- Checked
- Next check
- Status
- Current
-
- Source
- IETF RFC 3986, web address syntax (external site)
- Used for
- Privacy: why the part of a web address after # stays in your browser
- Quote
the fragment identifier is separated from the rest of the URI prior to a dereference, and thus the identifying information within the fragment itself is dereferenced solely by the user agent, regardless of the URI scheme.
- URL
- https://www.rfc-editor.org/rfc/rfc3986.txt
- Checked
- Next check
- Status
- Current
-
- Source
- Apache HTTP Server 2.4, log files (external site)
- Used for
- Privacy: what a web server's logs hold
- Quote
The server access log records all requests processed by the server.
- URL
- https://httpd.apache.org/docs/2.4/logs.html
- Checked
- Next check
- Status
- Current
-
- Source
- IETF RFC 9110, HTTP semantics (external site)
- Used for
- Privacy: why that part never travels with a link you follow
- Quote
A user agent MUST NOT include the fragment and userinfo components of the URI reference [URI], if any, when generating the Referer field value.
- URL
- https://www.rfc-editor.org/rfc/rfc9110.txt
- Checked
- Next check
- Status
- Current
-
- Source
- W3C Referrer Policy (external site)
- Used for
- Privacy: what our pages let your browser tell other sites
- Quote
The "strict-origin-when-cross-origin" policy specifies that a full URL, stripped for use as a referrer, is sent as referrer information when making same-origin requests from a particular request client, and only the ASCII serialization of the origin of the request client when making cross-origin requests:
- URL
- https://www.w3.org/TR/referrer-policy/
- Checked
- Next check
- Status
- Current
-
- Source
- ICO, individual rights (external site)
- Used for
- Privacy: your rights over your personal data
- Quote
Individuals have the right to access and receive a copy of their personal data, and other supplementary information.
- URL
- https://ico.org.uk/for-organisations/uk-gdpr-guidance-and-resources/individual-rights/individual-rights/
- Checked
- Next check
- Status
- Current
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- Source
- ICO, data protection complaints (external site)
- Used for
- Privacy: how to complain to the ICO
- Quote
Make a complaint about how an organisation has used your personal information
- URL
- https://ico.org.uk/make-a-complaint/data-protection-complaints/
- Checked
- Next check
- Status
- Current