Hi.Thanks for the replies.I have managed to get it working again.Well I should say my wife! I tried pressing all the buttons to try and reset dozens of times then my wife done it first time! Typical.Im not sure if my ipod nano had something to do with as I have just got a Nike+ Jacket and the nano stays close to your left wrist, where I normally put my watch.Im not sure if this caused any interference.Anyway I put it on my other wrist tonight and its fine.Touch wood.
Thanks for your help.
Ian.