I am trying to get admission into a British university.
I would like to choose a university in an area where the local people speaks in Posh accent.
Which region of UK speaks in Posh accent?
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If you think that there is an idyllic part of England where everyone speaks like Jacob Rees-Mogg, then you are very mistaken. Hardly anyone speaks like that now, apart from some sections of the British aristocracy.
There are YouTube videos that explain British accents far better than I can. Generally speaking, people in South England speak with accents closer to RP (received pronunciation) than do people living in the North.
My advice is to choose your university depending on what you want to study. It doesn't even need to be in the UK. You can get voice coaching in British RP anywhere.
If the OP really wants to go to a university, and area where he's more likely to hear RP then I'd recommend either Oxford or Cambridge University.
YouTube Video Oxford University students have their say
Not all, but a significant number of the students in the video have what I would call Received Pronunciation, inasmuch as their accents and speech are not regionally marked.
Received Pronunciation (/rᵻˈsiːvd prəˌnʌnsiˈeɪʃən/; RP) is the accent of Standard English in the United Kingdom, with a relationship to regional accents similar to the relationship in other European languages between their standard varieties and their regional forms.
RP is defined in the Concise Oxford English Dictionary as "the standard accent of English as spoken in the south of England", although it can be heard from native speakers throughout England and Wales.
Peter Trudgill estimated in 1974 that 3% of people in Britain were RP speakers.
RP enjoys high social prestige in Britain. It has thus been seen as the accent of those with power, money, and influence, though it has in recent times been perceived negatively by some as associated with undeserved privilege.
Since the 1960s, a greater permissiveness towards regional English varieties has taken hold in education
But just as the expression posh accent is considered derogatory and disrespectful, RP is considered archaic, and reminiscent of the British empire era. Nowadays, some writers use the term General English, BBC Pronunciation or Standard Southern British.
Received Pronunciation has sometimes been called "Oxford English", as it used to be the accent of most members of the University of Oxford. The Handbook of the International Phonetic Association uses the name "Standard Southern British". Page 4 reads:
P.S As for the OP's criteria for choosing a university, I am not here to judge, but perhaps the OP thinks he will understand RP/SSB more easily than a Scottish or Geordie accent, and they wouldn't be very wrong. However, British universities are attended by a huge range of people from different social backgrounds, accents, cultures, and countries. This is true for any part of Britain because it is a multicultural society.