If I remeber correctly its £54 each way to indulge to the Falklands. The 747 is very rarely at max payload and I can't remember anyone being bumped off since the charter has been operating. Cyprus is a different matter, You will probably find yourself on a waiting list and due to the various aircraft types they use for example if the trooper is a VC10, it will probably be full of duty pax. Don't forget a sponsor for the South Atlantic !
As stated though have a back up plan to get home or an understanding line manager. Try speaking to the movers at Brize for anymore info...