Uncle Phil said:
Your leader will be well informed. My spies tell me she's been out researching the route, with special attention paid to anywhere there's Tea. And Cakes.
All in the interests of the riders, of course.
Funny, your spy looked a lot like you, only dressed all in black and carrying a suspicious looking case. Trombone, or machine gun...?
Right, did the route yesterday and ended up doing 55 miles, but that was the longest of the return options, plus two laps of the block because I got home on 54.5, plus a detour done to save face when I realised I'd missed a turning but had already said a cheery hello to a chap in a field on a tractor, and didn't want to double back past him again...

It is mostly dead flat. Exceptions are a short sharp hill near Warthill, (had ne down to my little ring, but after that it's virtually downhill all the way to elevenses), and some rolling bits in the last few miles before Pocklington - felt worse yesterday because I had a headwind. Nothing to take me out of my middle ring though. Once we are past lunch, it is really very flat - the odd humpback bridge, but that's it.
Took me about an hour to get to elevenses, but I reckon we might take a nicer route which is possibly shorter, but certainly avoids trying to cross the A64. I started to think I was going to need to camp on the central reservatin yesterday (until a nice 4x4 driver slowed and flashed me across). Anyway, how about we aim to be meeting up for 9.30, but it won't matter if we don't get going until 10. It's not a long way between elevenses and lunch - we could afford to kill time in Pocklington - beware, lots of charity shops!
I got lucky yesterday, and found tea and cake in Elvington, as they were having a fete on. And typically, the next time they are doing tea and cake in the village hall there is in 2 weeks time....

I'll see if I can google anything happening along the way back next week, if not, there are villages with pubs if anyone feels in need of a stop (or there may be cake brought along)
I'm hoping this will be a leisurely-ish affair - can't believe I'm saying that of a potential 50+ miler! But (thinking of Mrs Landslide here) we can shorten it if anyone is flagging (that includes me!

)
If I can work out how, I'll bung up a link to a marked map...