I'm sure riders will be seeing this from official channels as I type, but there seem to have been massive problems securing the school at Spalding, so the organisers have pulled out all the stops and secured Boston Grammar School as an alternative.
That's Boston Lincolnshire, don't worry, no transatlantic crossing required
I'm unsure how this affects the planning for riders - I'll be a volunteer in Boston - but there is an issue for riders in the town. Because the route hits the main A16 dual carriageway it's been decided that riders will need to walk for about 200m on the pavement between the end of High Street, Boston and Rowley Road where the control is. I gather there will be marshals placed to assist riders (and presumably discourage riding on the narrow pavement).
This short walk avoids having riders negotiating nasty roundabouts and a very busy urban trunk road for several km.
The route has been updated on the official website -
https://londonedinburghlondon.com/routeAlthough this is a pain, I think the organisers need congratulating on sorting this out relatively pain-free.