I became uncertain of position on the final leg of my QXC, flying from Goodwood to Biggin Hill. I'd planned a route up to Guildford (a large town with a tall church and spire) then a right turn and track in to Biggin. I remember passing Dunsfold on my right and noticing that "the large town with the spire" that I wanted to get to was not on the heading that I had on my plog. So I turned to aim for that instead, away from my plogged heading. A few minutes later on reaching the end of the leg I had a couple of attempts at finding my three identifying features and still only had the spire. I realised I was not where I was supposed to be, and that the M25 and thus Heathrow was uncomfortably close.
Fortunately I had Farnborough on frequency as I'd called up for traffic information so I spoke to the nice lady and said I was uncertain of position. She said did I know Ascot I said no. She said did I know Kenly gliding site I said yes, so she gave me a heading to steer to get to Kenly.
Panic over, job done, home in time for tea.
No doubt if I had have actually been in danger of straying in to CAS she would probably have spoken to me first!