Looking at that night section on a reversed Flatliner, it's hardly any further to go to Boston from Kirton via Lincoln, Metheringham, Billinghay and Holland Fen. Much easier navigation on A/B roads, mostly, and usefully there's the 24 hour garage on the Burton Road roundabout in Lincoln [since there will have been nothing but an atm for p-o-p in Kirton]...Got to climb Canwick Hill though - hmm thought a reverse route got us out of that!
Then McD's in Boston and the choice of Spalding or Whittlesey for a 'spoons breakfast [or both - Huggy I'm looking at you - can you beat your record from this year's Flatlands?]