Depend upon Car reg City
as you city is shown lhr so for lhr reg car
a is purchasing, so a need these things from b
1=reg book(+ update tokens)
2=return file(invoice doc of car)
3=num plats if car is 2006+ model
4=transfer letter with cnic(transfer letter issue from inside excise, better to get transfer very 1st day)
5=sale dead(made from any near stamp paper shop)
n b need only a photo copy of sale dead n cnic copy of purchaser