I have (somewhere) not only the two books by Reid, but I think three more on the subject by Airey Neave. Sadly, the latter was later blown up by an IRA car bomb in the underground car park under the House of Commons (he was a Member of Parliament). Yes, I know I'm partly Irish, but I don't advocate car bombings.

The famous Colditz glider was hidden from the Germans by a false wall that the prisoners constructed, and the wings were folded up to fit it in the space.

One thing that sticks in my mind from the books is a rhyme (or chant, really) that the French POWs used to taunt the German guards with. It's somewhat vulgar, so I'll post it without translation into English:

Ou sont les Allemands?
Les Allemands sont dans la merde!
Pourqouis ils restent?
Ils surnagent!