Just one question for those who have done this before....when I rang Interflight and arranged the slot and everything I then asked the woman on the phone if there was anyone else I needed to call prior to arriving; she said no, just book out at Thruxton (my departure airfield) I took that to mean just the normal thing one would do for any flight....but then I wondered...is there something else?
Perhaps a full flightplan? I know formally it's not required, but it may help you "get in the system" easier.