Thanks for the info Tony. All the areas that you have mentioned are quite close to me, so I will be giving them ago. I only have a cheap detector, but it will do for now. I found a lot of metal on the beaches at Llandulas. I would love to go into the areas around Ruddlan castle, but I am sure you wouldn't be allowed. If I have any luck I'll post it on here. Ian if you fancy going out sometime drop me a pm.
Steve