Thanks guys.
I tried Hydlemans, and they were not that helpful. They could give me a list of Bessey retailers but couldn't tell me who stocks the clamp or UK prices. So I'll have to ring around for stockist and prices.
The Trend one is OK, but the pin is 9mm and I need 8mm or smaller, and at £11 each they are a bit expensive.
I am looking for these or something similar for a project I am working on to make a router table and fence and am looking for a suitable clamping method for the fence which is easy to implement and will clamp securely.
I have suppliers for the phonelic coated top, a strong aluminium frame to support it, to keep it flat and secure it to legs, and the fence material for making a split fence, all for less than £70, it is just the clamps that are causing me a problem at the moment.