That route looks a cracker. I've been keeping an eye on this thread as I'd love to do it, but the logistics of work etc in September are still an unknown so I haven't thrown my hat into the ring yet.
As a local who has cycled much of this route may I offer the following observations..........
1) For history lovers, the route passes the site of the Battle of Towton (War of the Roses) just south of Towton at mile 16. There is a battle field "trail" here with information boards at various points. Well worth an hour of your time if that kind of thing rings your bell.
2) The route immediately after Towton (miles 17 to 18) is on farm tracks. For people with skinny tyres it may be worthwhile staying on the A162 north from Towton for half a mile, then turning right onto the B1223.
3) The route from Mile 18 to Cawood is flatter than a flat thing that has been run over by the worlds biggest steamroller. For lovers of all things flat, this will be the happiest 6 miles of their lives.
4) Re' a potential cafe stop in Cawood. A mile before the village at around mile 23 you pass the Cawood Park caravan site on your right, with Mrs B's Lakeside Kitchen. I've not been there personally, but have heard good things about it from friends who live locally. It might be worthwhile forewarning them so they can get sufficient sausage rolls in.
5) The route between Stamford Bridge & Malton (miles 42 to 54) is, for my money, one of the most fantastically scenic bits of riding anywhere in this part of the country, It's rolling countryside, but nothing too challenging. The scenery around there is stunning, and I hope you get a bright day to be able to appreciate it.
6) And for people with time to kill the following day, there's always the old cinder track from Scarborough to Whitby. This can be a bit rough & boggy in places for skinny tyres, but takes in some beautiful scenery and coastline. Robin Hoods Bay, if you are able to get that far, is surreal.
Interesting read
regarding point number 6, I have opted to stay in Scarborough for a week, arriving by car, so I might take my hybrid with me to and if the other half dosent object to much give this route a go