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I did 197NP for 258 miles, although I did have nearly half an hour off the bike. No support, so I had to stop and restock with supplies four times. And have a wee, once, but it was a very, very long wee. And message @Cycliste with brief updates.
I'm now looking at the E2/12 in August, where I should be able to rustle up plenty of helpers, and starting to think that 270 miles wouldn't be out of reach.
Lauder needs to do work on position and on stop strategy. That's a poor return on that power!