I have been looking for a reversing ring which is filter thread to filter thread and not camera body to filter thread. Can't see one anyplace. Does any-one know of a supplier?
What I want is one which is 62mm to 52mm.. or 62mm to 55mm.

Why not get 2 Cokin adapters? Get a 62mm one and a 52mm one and glue them together. http://www.cameraworld.co.uk/ViewProdDetails.asp?prod_code=PON05J000017&prod_name=Cokin%20Adapter%20Rings

Excellent idea Mikey, I got two today P type fitting so they had broad flanges and stuck them with twin bond glue. They work fine.
Anyone who wants to get macro work done without losing the camera automatic stop down can do that easily. I can now put an 80mm lens on the front. I do lose a bit of pic but I can keep further away from the subject. Anyone who has a 50mm lens can put it on the front of a telephoto or zoom and get to over twice lifesize, use flash and cover camera movement like that.
Thanks for thinking of it ! !