one of the airports is usually really easy to see. It sticks out like a sore thumb. I couldn't believe it when I failed to spot it.
I seriously thought I was going to be the first student in living history who failed to find it.
Peterborough is renown for being tricky to spot when you approach from a certain direction, so I wasn't too concerned. Once I realised I was overhead the town I just did a couple of orbits until I spotted it.