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@randombadger69
Have this happen periodically at work. Two options when you do come to removing the offending crank.
A. Find a shop with a suitable tap and puller, and get them to cut some new oversize threads.
B. As i did recently, quicker and easier. Get one of these..
http://www.avenue35.co.uk/shopping/shopexd.asp?id=13466
Then remove your chainring. Wedge the fork of the ball joint separator between the B/B cup and the back of the crank with a few persuasive taps from the proverbial hammer.
Then heat the crank with a blowtorch for a good 5 mins. Finally once the alloy has heated nicely hit the ball joint separator with good force and the crank should just "fall off".