Piper Warrior Pilot,
Comair offers a space available roundtrip ticket to visit their facilities in Orlando. I've only ever heard of people coming from other cities in the U.S, but since it's free standby travel on Delta (or any Delta Connection airline), I don't see why they can't provide travel from the U.K.
I'd call them up and see what they can do for you. Phone number is 1-800-8226359 (UCANFLY).