Thanks for the advice. I didn't go fot it. It was a guy in a market stall. He had a couple of A500+'s but they were filthy. I have however just unearthed one in the attic and will be hooking it up to test it.
I'll start a new thread if I have issues with it, but the plan is to clean it up wih retrobrite, fit a CF card, a new Indivision and accelerator from Jens and use it as a WHDload machine as well as the A4000 that I have.