Just a thank you to all the guys who replied to my question about removing a sheared off dropout adjuster. It was in fact sheared flush at the rear and only about 7mm left of the portion inside the dropout with the screwdrover part sheared also. I managed to drill a 1.5 mm hole down the inside of the screw (centre punch first) and then used an aero industry "easyout" to extract it. This is a tapered left hand thread - you screw into the hole until - when it can go no further due to the taper it extracts the remainder of the screw. The thread can then be cleaned up with a 3mm tap. Hope this helps someone in the future!!
Pete Geldard
Surrey
U.K