Got 100 pos feedback on eBay. Woohoo. It took like four years but I made it (slowed down in the last few years mind you - keep forgetting to do eBay).
My eBay Tuesday - Post Office queue was long, too half an hour to dispatch the first book (something that takes less than a minute to do). Today with the second one, got through a shorter queue much faster. Prob Tuesday was first post day after Bank Holiday so it was busy. And the 1st class postage seems cheap.
Don't think I'll get to 500 any time soon (for the next star up).