The HAPPY vowel is tense, but unlike Received Pronunciation, it is long [iː], as in the FLEECE vowel (see Happy tensing).
As in many other southern Welsh accents, the NURSE vowel is rounded and fronted to [øː]. However, a small minority of speakers realise it as [əɾ ~ əɹ].
The horse–hoarse merger is absent in PTE, hence the words horse/ɒː/ and hoarse/oː/ are kept distinct. /oː/ is found in fortress and important, where the horse vowel may be found in other dialects that keep the distinction.
/ə/ has an open-mid [ɜ] when stressed, and slightly close-mid [ɘ] unstressed.
The trap-bath split is nearly absent, although the word bath along with path, laugh and its derivatives, ghastly and last(ly) have a long PALM/aː/, yet just like in Northern England, the remainder of BATH words are short /a/.
The TRAP words bad, bag and man are often found with long /aː/.
Diphthongs of PTE are /ɪʊ, eɪ, oʊ, ʌɪ, ʌʊ, ɒɪ/. PRICE words are mostly pronounced with /ʌɪ/, but there also exists a marginal /aɪ/ which appears in a small number of words, such as Dai and aye.
PTE, like other Welsh dialects, has preserved several diphthong-monophthong distinctions that other varieties have not. They include:
A distinction between /ɪʊ/ and /uː/, corresponding to the GOOSE vowel in other dialects. Thus the pairs blue/blew and grue/grew are not homophones.
When a word is spelt with an ⟨o⟩, the corresponding vowel is /uː/. It also occurs in the words insurance and surety.
The spellings ⟨u⟩, ⟨ue⟩ and ⟨ui⟩ before ⟨r⟩ are typically pronounced /uː/.
/uː/ can also be found in the word blue, and the sequence ⟨luC⟩, such as flute, lunatic and Pluto
/ɪʊ/ is found otherwise, such as clue or glue.
The sequence /juː/ in most dialects will be rendered as /jɪʊ/ in word-initial position and after ⟨y⟩, such as use and youth. /ɪʊ/ is pronounced in all other positions, but can be possible also word-initially. You and its derivates can be pronounced either as /jɪʊ/ or /ɪʊ/.
Another distinction for the FACE and GOAT lexical sets, thus the minimal pairs pain/pane and toe/tow (see Long mid mergers). They are generally diphthongised as /eɪ/ and /oʊ/ when the spelling contains ⟨i⟩/⟨y⟩ and ⟨u⟩/⟨w⟩ respectively and monophthongised as /eː/ and /oː/ elsewhere. However, these are subject to several exceptions:
The FACE vowel is always diphthong word-finally or preceding a vowel. It is further seen in the suffix sequence ⟨-atiV⟩, thus café, mosaic and patience are always /eɪ/. It is usually a diphthong before a nasal (strange and came), however proper names do have a monophthong (Cambridge and James).
The FACE is a monophthong in bait, gait, gaiter, Jamaica, raisin, traipse and waist, despite having ⟨i⟩ in the spelling.
Before a single ⟨l⟩, the GOAT is always diphthongal, such as coal or gold. The spelling ⟨oll⟩ is diphthongal in roll, stroll and its derivatives, yet monophthongal elsewhere.
GOAT is monothongal in (al)though, and morpheme-final -ow (elbow and window), even though ⟨u⟩/⟨w⟩ is present.