Hi and thanks for your messages, they're much apriciated.
I feel such an idiot. I'd plugged into the socket in the strap button but this had been disconnected and a new socket had been drilled in the bottom corner. I only noticed it when my tech guy took it out to check it over. So I have an H575 that plays great, sounds great and works perfectly. I have to say the dealer I bought it from was excellent, friendly and immediately willing to help with sensible solutions to my perceived problems (am I allowed to mention dealers here?) He was also very happy when I revealed my stupidity!
My tech guy wanted to buy the guitar off me there and then. Of course I said "No". A really lovely guitar that's going to be used a lot.
Hey H I'm not too far from you I'm sort of Bury st Eds/Newmarket way.