Update (just in case anyone gives a shit!).
I got two prices, one from a company looking at photos, the other when I persuaded the guy to take the car to a garage.
These quotes were £300 and £480 respectively, compared to his original request for £882 plus expenses.
While I could play hardball and say I'll only pay for the lowest quote, I'm minded to say the middle price is ok and I'll pay that (but no more, including his 'expenses'). Partially because the £300 quote could always rise when the company actually see the car, and secondly because he did take the trouble to take the car to the £480 garage.
Agree?
Sounds fair and like the correct path to me.
It's always good to walk away knowing that you've done 'the right thing.' Many don't but who wants to live life like that? Sounds like a good solution.