Your average scrap yard is going to offer you as little as they think they can get away with, but usually the maximum they will pay is £50-£70, and that's only for certain cats they are on the lookout for.
For the best price, you have to find someone who specialises. I know somebody who buys cats from yards, he takes his to a place in London, who then ships them on in bulk to Germany for processing. The prices he sees are very different to the going rates, and some are worth serious money. He did enquire about the 08 Jazz, and he did tell me what he would get for the cat. I'll not post it on here, I'll send you a quick pm.