The UK keyboard has 1 more key than the U.S. keyboard (UK=62, US=61, on the typewriter keys, 102 v 101 including function and other keys, 105 vs 104 on models with Windows keys) Since the standard US keyboard layout in Microsoft Windows offers no way of inputting any sort of diacritic or accent, this makes it unsuitable for all but a handful of languages unless the US International layout is used. The US International layout changes the ` (grave), ~ (tilde),

Early versions of Windows handled both the differences between the two keyboards and the differences between American English and British English by having two English language options — a UK setting and a US setting. While adequate for users in the United States, United Kingdom, and Ireland, this solution caused difficulty in other English-speaking countries. In many English-speaking jurisdictions (e.g., Canada, Australia, the Caribbean nations, Hong Kong, Malaysia, India, Pakistan, Bangladesh, Singapore, New Zealand, and South Africa), orthography has traditionally conformed more closely to British English usage, while these countries have chosen to use the United States keyboard layout. People in these countries were as a result required to choose a system setting inconsistent with their localised version of English, thereby causing traditional British English to fall out of favour. This is particularly evident with spelling, where words such as "colour" and "centre" are flagged as being spelled incorrectly by word processing software when the operating system is set to the US setting. AltGr+vowel produces the acute accent variant of that vowel as needed for Irish. Diacritics used in Scots Gaelic and Welsh require the UK extended keyboard setting.

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The UK variant of the Enhanced keyboard commonly used with personal computers designed for Microsoft Windows differs from the US layout as follows: Main articles: QWERTY §US-International, and QWERTY §United Kingdom (Extended) Layout US International keyboard layout United Kingdom Extended keyboard layout