A necessity: My Psion computer, because it has everything in it: addresses, notes or whatever.

A luxury: Music. I always have my CD player and something to listen to. I always mean to take a book but don't always do it, so I put the CD player on. It stops me getting bored.

A good-luck charm: My old dog tags. I am a terrible flyer and very superstitious. I was given a coin too so I added that to my dog tags, and then when I was in Iraq I found an old British penny so that is on there as well. I always wear them round my neck. I won't fly without them.

If only: I hate driving but I have to do a lot. A really fast car where you could just get in and not have to touch the gears or anything would be wonderful. It would be as fast as flying while remaining on the ground.

• Chris Ryan's SAS Fitness Book is published by Century at £12.99.