Someone who came from Hull would probably use a different vowel (at least, among friends) - more like the one in
pull. The Received Pronunciation vowel sound is /ʌ/. That doesn't mean that other accents are wrong - just that they may be misunderstood in contexts where
RP is expected.
As in this exchange between a London (Home Counties) solicitor and his (Northern) clerk:
(Excuse puerile joke; my point is serious)
RP: 'I've left the file at home and I need it in court this afternoon.'
clerk: /fʌks ɪt
ɷp/ ['Fax it up.']
RP: 'Yes, it does, rather.'
b