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I can't remember the specifics (think I'll give them a ring tho just to make sure I've measured up everything properly) but the necessary chop down will completely remove all the threads that are currently there.. So a fair amount of threads need to be cut. It seemed like it was just a flat rate + the cost of shortening the steerer. He reckoned £15 all in all so I'd hazard a guess at £10 for the threads to be extended and £5 for the chop down.
Spoke to seabass, I wouldn't be able to drop it off today and their quote was a bit vague. As I'm free I took the trip it to SBC cycles who should hopefully have it done by the end of the week