I wouldn't have told them, I don't know a single person on a normal policy who has been asked for mileage proof.
OK well to be honest, I haven't actually increased the mileage just yet.
I have made the change from social and commuting to social commuting and business, which put it up from £81 to £87 a month, so that I'm covered for Monday when I start.
If I change it from 10K PA to 20K PA it will take it to £117 a month. I was going to hold off from doing that until I have had precisely this discussion with a few people...
One, will they actually ask for proof of mileage under any circumstances? And two, whats to say that I didn't put thousands of miles on from driving on private roads, or doing hundreds of dyno runs? Or maybe "I have a thing for lifting the front wheels off of the ground and pretending I'm a race car driver sir."

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