The grease, which I thought was causing issues with braking (pulling to the left) wasn't!!!
Basically, whoever put on new calipers, on the right didn't bother to replace the disk or the pads as both are shot and very dangerous
(took the family out on a 150 mile round trip!!!)
Sent an e-mail to the bloke I bought it off, and he replied saying that he was unaware of this, but has offered to cover the cost of the replacement parts etc.............. What can I say?
I will gladly take up his offer and see if he keeps his end of the bargin!!