Phonological features characteristic of British English revolve around the pronunciation of the letter R, as well as the dental plosive T and some diphthongs specific to this dialect.
In a number of forms of spoken British English, it is common for the phoneme /t/ to be realised as a "glottal stop [ʔ] when it is in the intervocalic position, in a process called "T-glottalisation. Once regarded as a Cockney feature, it has become much more widespread. It is still stigmatised when used in words like later, but becoming very widespread at the end of words such as not (as in no[ʔ] interested). Other consonants subject to this usage in Cockney English are p, as in pa[ʔ]er and k as in ba[ʔ]er.
In most areas of Britain outside "Scotland, the consonant R is not pronounced if not followed by a vowel, lenghtening the preceding vowel instead. This phenomenon is known as "non-rhoticity. In these same areas, a tendency exists to insert an R between a word ending in a vowel and a next word beginning with a vowel (as in "my idea" > "my ridea"). This is called the "Linking R. This could be understood as a merger, in that words that once ended in an R and words that didn't are no longer treated differently.
British dialects differ on the extent of diphthongisation of long vowels, with southern varieties extensively turning them into diphthongs, and with northern dialects normally preserving many of them. As a comparison, North American varieties could be said to be in-between.
In the South
Long vowels /i:/ and /u:/ are diphthongised to /ɪi/ and /ʊu/ respectively (or, more technically, [ʏʉ], with a raised tongue), so that ee and oo in feed and food are pronounced with a movement. The diphthong [oʊ] is also pronounced with a greater movement, normally [əʊ].
In the North
Long vowels /i:/ and /u:/ are usually preserved, and in several areas also /o:/ and /e:/, as in go and say (unlike other varieties of English, that change them to [oʊ] and [eɪ] respectively). Some areas go as far as not diphthongising medieval /i:/ and /u:/, that give rise to modern /aɪ/ and /aʊ/; that is, for example, in the traditional accent of "Manchester, 'out' will sound as 'oot', and in parts of "Scotland, 'my' will be pronounced as 'me'.
Loss of grammatical number in collective nouns
A tendency to drop "grammatical number in "collective nouns, stronger in British English than in North American English,  exists. This is namely treating them, that were once grammatically singular, as grammatically plural, that is: the perceived natural number prevails. This applies especially to nouns of institutions and groups made of many people.
The noun 'police', for example, undergoes this treatment:
Police are investigating the theft of work tools worth £500 from a van at the Sprucefield park and ride car park in Lisburn. 
A football team can be treated likewise:
Arsenal have lost just one of 20 home Premier League matches against Manchester City. 
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As with English around the world, the English language as used in the "United Kingdom is governed by convention rather than formal code: there is no body equivalent to the "Académie française or the "Real Academia Española. Dictionaries (for example, "Oxford English Dictionary, "Longman Dictionary of Contemporary English, "Chambers Dictionary, "Collins Dictionary) record usage rather than attempting to prescribe it. In addition, vocabulary and usage change with time: words are freely borrowed from other languages and other strains of English, and "neologisms are frequent.
For historical reasons dating back to the rise of "London in the 9th century, the form of language spoken in London and the "East Midlands became standard English within the Court, and ultimately became the basis for generally accepted use in the law, government, literature and education in Britain. To a considerable extent, modern British spelling was standardised in "Samuel Johnson's "A Dictionary of the English Language (1755), although previous writers had also played a significant role in this and much has changed since 1755. Scotland, which underwent "parliamentary union with England only in 1707, still has a few independent standards, especially within its separate legal system.
Since the early 20th century, British authors have produced numerous books intended as guides to English grammar and usage, a few of which have achieved sufficient acclaim to have remained in print for long periods and to have been reissued in new editions after some decades. These include, most notably of all, Fowler's "Modern English Usage and "The Complete Plain Words by "Sir Ernest Gowers. Detailed guidance on many aspects of writing British English for publication is included in style guides issued by various publishers including "The Times newspaper, the "Oxford University Press and the "Cambridge University Press. The Oxford University Press guidelines were originally drafted as a single broadsheet page by "Horace Henry Hart, and were at the time (1893) the first guide of their type in English; they were gradually expanded and eventually published, first as "Hart's Rules, and in 2002 as part of The Oxford Manual of Style. Comparable in authority and stature to "The Chicago Manual of Style for published "American English, the Oxford Manual is a fairly exhaustive standard for published British English that writers can turn to in the absence of specific guidance from their publishing house.
- "Canadian English
- "Comparison of American and British English
- "Australian English
- "Commonwealth English
- In British English "collective nouns may be either singular or plural, according to context. An example provided by "Partridge is: " 'The committee of public safety is to consider the matter', but 'the committee of public safety quarrel regarding their next chairman' ...Thus...singular when...a unit is intended; plural when the idea of plurality is predominant". "BBC television news and The Guardian style guide follow Partridge but other sources, such as "BBC Online and The Times style guides, recommend a strict noun-verb agreement with the collective noun always governing the verb "conjugated in the singular. BBC radio news, however, insists on the plural verb. Partridge, Eric (1947) Usage and Abusage: "Collective Nouns". Allen, John (2003) BBC News style guide, page 31.
- "British English; Hiberno-English". Oxford English Dictionary (2 ed.). Oxford, England: Oxford University Press. 1989.
- British English, Cambridge Academic Content Dictionary
- The "Oxford English Dictionary applies the term to English as "spoken or written in the "British Isles; esp[ecially] the forms of English usual in "Great Britain", reserving ""Hiberno-English" for the "English language as spoken and written in "Ireland". Others, such as the Cambridge Academic Content Dictionary, define it as the ""English language as it is spoken and written in England".
- Jeffries, Stuart (27 March 2009). "The G2 Guide to Regional English". "The Guardian. section G2, p. 12.
- McArthur (2002), p. 45.
- "English and Welsh, 1955 J. R. R. Tolkien, also see references in "Brittonicisms in English
- Professor Sally Johnson biography on the "Leeds University website
- Mapping the English language—from cockney to Orkney, "Leeds University website, 25 May 2007.
- McSmith, Andy. Dialect researchers given a "canny load of chink" to sort "pikeys" from "chavs" in regional accents, "The Independent, 1 June 2007. Page 20
- "Received Pronunciation". Retrieved 20 March 2017.
- BBC English because this was originally the form of English used on radio and television, although a wider variety of accents can be heard these days.
- Sweet, Henry (1908). The Sounds of English. Clarendon Press. p. 7.
- Fowler, H.W. (1996). R.W. Birchfield, ed. "Fowler's Modern English Usage". Oxford University Press.
- Franklyn, Julian (1975). A dictionary of rhyming slang. London: Routledge and Kegan Paul. p. 9. "ISBN "0-415-04602-5.
- "Trudgill, Peter (1984). Language in the British Isles. Cambridge, England: Cambridge University Press. pp. 56–57. "ISBN "0-521-28409-0.
- , "Oxford dictionary website, 02 April 2017.
- , "BBC, 8 January 2017.
- , "BBC, 2 April 2017.
- McArthur, Tom (2002). Oxford Guide to World English. Oxford: Oxford University Press. "ISBN 0-19-866248-3 hardback, "ISBN 0-19-860771-7 paperback.
- Bragg, Melvyn (2004). The Adventure of English, London: Sceptre. "ISBN 0-340-82993-1
- Peters, Pam (2004). The Cambridge Guide to English Usage. Cambridge: Cambridge University Press. "ISBN 0-521-62181-X.
- Simpson, John (ed.) (1989). Oxford English Dictionary, 2nd edition. Oxford: Oxford University Press.
- Sounds Familiar? – Examples of regional accents and dialects across the UK on the "British Library's 'Sounds Familiar' website
- Accents and dialects from the British Library Sound Archive
- Accents of English from Around the World Hear and compare how the same 110 words are pronounced in 50 English accents from around the world – instantaneous playback online
- The Septic's Companion: A British Slang Dictionary – an online dictionary of British slang, viewable alphabetically or by category
- British English Turkey