buy the newest, safest tyres you can. most tyres in PK have had the date stamps changed so i'd suggest that since you are in LHR you can go to the tyre dealer on MM Alam road and buy original tyres from a recognized (internationally) supplier.
don't buy tyres from unrecognized shops, no matter how hard they try to say that they are original suppliers, they are almost ALL selling cheap, old, smuggled & hard tyres.