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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.
Yeah, that does seem like a poor return on the effort. I did 200NP for 265miles with 7 mins off the bike (turns out I have a tiny bladder).