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Hello dear !
Pakistan is one of the commonwealth countries.
You can apply for a visa to come to the UK and either or work here in the UK.
You have live for a certain years before you will be eligible to apply for British passport.
Perhaps you were thinking to apply for an Ancestry visa.
You can apply for an Ancestry visa to work in the UK if you have a British grandparent and meet other eligibility criteria.
There are different routes which you can apply for to come to the UK.
Here is the link for you to explore all the options: https://www.gov.uk/apply-to-come-to-the-uk
You can enter the UK, but the problem lies with EuroDac system. Your fingerprint is already registered in somewhere else. They might or might not send you back if you make a claim for Asylum. Sometimes, countries do not want to take failed asylum seekers, then the UK has to decide his claim here.
I am sharing two articles which might be helpful for your better understanding:
I hope this helps.
For future information, please start your question with ‘For TK Legal’.
You can always link to my profile for another question at a later time.
Have a nice weekend!
Kind regards, T.K.
No worries at all. Take care!