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hugo7-
Axminster stuff is generally pretty good.
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If you need accuracy of removal, probably the best bet is spark erosion, at a cost £££.
The difficulty will be drilling in the centre of the broken part. -
Would it be accessible to a MIG welder? If there are exposed threads, which there are given the question about JB Weld, my method of choice would be to weld a nut on the end of the broken bolt and use that to wind it out. If it's corroded in place the heat from the welding will also help break the grip of the corrosion.
JurekB
freezing77
Brommers
You are much better locking the two nuts together by tightening them into each other and using high strength threadlock to assist. the majority of the lock force will be the two nuts being tightened up to each other.
Loctite 270