Finding an expert

[Irri]

I've decided to take the plunge on a gen 1 997 cab. I'm hoping for a 4s.

If I want buy from a private seller, how do I go about getting a warranty? Are there people who will come and inspect the car and offer a warranty for a price?

I live in London, but am guessing a car from outside London might have less city miles.

Any recommendations appreciated.