Saturday beckons because....
Twice as many trains ph back to The Great Wen.
Andy's Snacks in Rochester doesn't open Sundays, and the alternative isn't anywhere near as good.
Saturday's wind is favourable.
We can go somewhere else on Sunday
Here's me guessing.....
Tim Hall may ask for an 08:30 departure as he has done so before - on account of trains or summat - so that's ok.
So we'd be at Greenhithe an hour and a half-ish later.
Wow, we could meet you at the station or outside the Asda (prolly better). Although you probably have it, I'll e-mail you a .tcx file of the route.