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Howard
@tgotb
I think you can fix it anywhere you like, so long as you don't receive outside assistance (and obviously good not to get in anyone's way). Pits allow you to get help/kit from other people. I was chatting with someone who left the course to get first aid treatment a couple of weeks ago. The comms then allowed him to rejoin the race, the only stipulation being that he do it from the same point he'd left, so I doubt you'd upset anyone if you ducked under the course tape to perform your repair in a safer location.
For league races, no need to be sneaky about wider tyres; it's totally legal. If it wasn't, newcomers to the sport wouldn't be able to try it out on MTBs, which would be a really bad thing. You only need to stay within the 33mm limit at National Trophy races and above; the comms in Derby yesterday had a jig, and were checking tyres before riders were called up at the start of the elite races.