Car appreciation... the aesthetics, the engineering, etc

@Fox there's no reason you have to peg your offer to what he paid or the money he's put in to it. Price in the risk, you don't have to justify it. 'Nice car, I'd be comfortable paying £x'. Thats it.

I paid £12,000 or so for my C55, and have put over £10,000 into it since then.

I don't think I'd be able to ask for £22,000 for it (much as I'd love to).