When referring to British English, I am referring to non-colloquialized British English. The pronunciation, as it is intended in a formal and correct sense. Given the enormous and varying accents across the United Kingdom, it is impossible to give an accurate assessment; it would require a thesis. I am using American English and British English; within the least colloquialized forms. There are exceptions to all the rules.
As for Australian English, it was originally influenced by the British, but now is equally influenced by American English; so makes an interesting study of a hybrid of the two. (my opinion and observation)
I am trying to best answer a question that has an encyclopedia of answers and exceptions.
The sound of a t at the beginning of a sentence is an aspirated t; which is used in both American and British English.
A final t becoming a de-aspirated is a glottal stop, this is used in both American and British English.
A flap is not used in British English.
There are varying colloquial pronunciations within both American and British English.
Living in Australia, we are influenced by an interesting mixture of American and British English. As a general rule, the extent to which a person uses non-colloquialized British English, is an indicator of social class and education. The more British, the higher perception of social class. A good example of this being in the use of tapping. The pronunciation of potato with two t sounds as opposed to potado.
I have provided extensive quotes.
Tapping of / t / In American English, if a /t/ sound is
between two vowels, and the second vowel is not stressed, the /t/ can
be pronounced very quickly, and made voiced so that it is like a brief
/d/ or the r-sound of certain languages. Technically, the sound is a
‘tap’, and can be symbolised by /t̬/. So Americans can pronounce
potato as /pəˈteɪt̬oʊ/, tapping the second /t/ in the word (but not
the first, because of the stress). British speakers don’t generally do
this. The conditions for tapping also arise very frequently when words
are put together, as in not only, what I, etc. In this case it doesn’t
matter whether the following vowel is stressed or not, and even
British speakers can use taps in this situation, though they sound
The glottal stop In both British and American varieties of English, a /t/ which comes at the end of a word or syllable can often
be pronounced as a glottal stop /ʔ/ (a silent gap produced by holding
one’s breath briefly) instead of a /t/. For this to happen, the next
sound must not be a vowel or a syllabic /l/. So football can be
/ˈfʊʔbɔːl/ instead of /ˈfʊtbɔːl/, and button can be /ˈbʌʔn/ instead of
/ˈbʌtn/. But a glottal stop would not be used for the /t/ sounds in
bottle or better because of the sounds which come afterwards.
British English, as represented by
Received Pronunciation (RP)...
American English, as represented by General American (GA)...
As an aspirated sound [th ], when it is the ﬁrst sound of a word, as
in tempting["t h emptI6], or in an inner and stressed position, as in
potential [p@"t h enSl].
As an de-aspirated sound [t], when the syllable does not carry the
stress, as in the second t in tempting["t h emptI6], or after [s] as
in stop[stA:p], or at the ends of syllables as in pet[pet], or
As a ﬂapped sound [R], the most distinguishing allophone, which consists of
pronouncing an alveolar ﬂap instead of the plosive dental [th ] or
de-aspirated [t]. This change occurs when t is at an intervocalic position, the ﬁrst
vowel being stressed, as in water["wO:t@r]. This phenomenon also
applies when words are linked together in a full prosodic unit, as in
the sentence What is this?["w2RIz"ðIz] when uttered it in colloquial
As a glottal stop [P]. A glottal stop
is a voiceless sound produced by the obstruction of the airﬂow in the
vocal tract. The glottis is the organ that actually prevents the air
from passing through the vocal tract. The glottal stop substitutes the
de-aspirated [t] sound at the end of words, as in put[puP] or
report[rI"pO:rP], and also in the presence of a stressed syllable
followed by patterns [t+vowel+n] or [tn], as in button["b2Pn], or
As a glottalized stop [tP ]. In a glottalized [tP ] the stop [t] and
the glottal stop [P] are produced at the same time. For its
production, this allophone follows the same rules as the glottal stop
does. Example where this sound can be found are mutton["m2t Pn], or
The sound [t] could be completely omitted in some circumstances. In
the presence of the pattern formed by a stressed vowel followed by
[nt], sound [t] is not pronounced in some varieties of GA. Thus, we
can hear winter["wIn@] or center["sen@r].
Both GA and RP have aspirated and de-aspirated [t] sounds, which, in a
formal or simply careful enunciation, are the only two sounds
corresponding to stop [t]. In colloquial and other registers, the
other allophones may appear. In the RP the ﬂap [t] is never used, but
instead it is pronounced as a de-aspirated [t] or as a glottalized [t]
(see [AE92] for a description of this sound). Glottal stops are common
in both varieties of English and follow similar rules in general. The
omission of the sound [t] in RP can also be found.
British and American English Pronunciation