Any experiences with the London airports?
Which have good parking facilities for motorcycles - security cameras, wardens to monitor, security rails etc?
Which are cheap/free and which are likely to offer bad experiences?
Heathrow is fine. With undercover parking and rails to chain bike to. Not used other airports yet.
Have a look here http://motorcycleparking.com/airport_parking.shtml. I use Gatwick and Stansted and have found the information accurate.