As the leg progressed, I saw a town in my 10 o'clock (I took as Milton Keynes), another in my 2 o'clock (which I took as Leighton Buzzard). I made out a disused field abeam on my LHS, around my half way point. (I took this as the disused field at Little Horwood). As everything seemed to ‘fit’, I maintained the heading. Unfortunately, the towns were in fact Leighton Buzzard to my left, and Hemel Hempstead to my right.
The day they stick large visual idents on towns, lakes and roads is the day I'll stop banging on about the CAA's regressive attitude to GPS.