Hi Dave
at last all sorted, turned out it was the rear right wheel bearing was a faulty part, to cut a long storey short the lad a the garage said he thought the part looked a bit iffy when he fitted it, something to do with the magnetic rings, anyway he took it back out and replaced with another new part and everything went back to normal, even put the old abs sensor back on and everything is fine, took it out for a drive where i could keep a constant speed and everything is clear, no lights on dash, very happy now.
thanks very much for your help