Do I need clearance from all the cities?

I need guidance with regards to police clearance certificate from Pakistan. In past 10 years I stayed in Pakistan except one years masters program that I attended in UK. All the time I stayed in Pakistan I lived in three different cities.

  1. Do I need clearance from all the cities? I have only got certificate from my current city which covers 2 years history.
  2. I don’t have a permanent address in UK and I lived there for 15 months for masters. Do I need police clearance from there too? If yes please tell the procedure