If I rank them it'll be:
Manchester - don't choose Manchester Metropolitan, must be University of Manchetser
Newcastle- good University again, one of those "older university"
Exeter + southampton - similar ranking and Level, then it depends if you want a city feel or country feel
Kent - is not a very good university but new. Great location (Canterbury) but not as good as Manchester
I would choose Warwick for PCL. PCL is very difficult course and even my friend from Cambridge said is hard.
There's a course from King's College which collaborate with HKU, to offer a 5 year LLB course but it will both be recognise in Hong Kong and UK. I think that is the best course (for both side) if you can get in.
I would go for well-known, Russell Group and Aldwych Group university to apply going back to Hong Kong. even the "ranking"is not that good, I would still prefer University that is established (and not those post-1992) Universities
Admission to Warwick normally means that the applicant is good enough to be admitted by CUHK as well. If PCLL in Hong Kong is the target, one should consider CUHK instead!
My son got an offer from Warwick for three elective subjects in DSE at Grade 5, M1 or M2 can be one of these 3 subjects. However, for CU, the entry requirement of Law at least 5-6 subjects with 5*
I would definitely put Queen Mary as my first choice.
I wouldn't consider aberdeen as it is a scottish university that runs a slightly different system to the English law.
then it'll be Lancaster then strathclyde.