Zitat

Originally slated for October 2009, the replacement of the Tornado F3 aircraft deployed to RAF Mount Pleasant, Falklands Islands was brought forward to 12th September 2009 as part of the MODs accelerated effort to withdraw the Tornado F3 from service.

Four Block 8 Typhoons will replace the four Tornado F3s currently assigned to RAF 1435 Flight. I expect the choice to use Block 8 airframes is to maximise the time they can be away from the UK before they need to return for a major service or upgrade. This did cause a problem with airframe selection though. The RAF only have 10 Block 8 airframes, with two being assigned to 17(R) Squadron who require the latest build for the type of work they do, that only leaves 8 airframes. Of those, 2 were only delivered in mid to late August, giving very little time to iron out any issues.
With a distance of about 8000 miles to cover the RAF covers itself for an airframe becoming unserviceable by sending an extra aircraft. Called an air spare, it's job is to fly with the other aircraft until they are sure there isn't any technical problem with the others. At this point it will return to its base, allowing the other four to continue on.

Carrying out the work up and delivery of the Typhoons is Number 3(F) Squadron.

With such a distance to cover the Typhoon requires air to air refueling. This was provided by a RAF Tristar and two VC-10s (which were also carrying freight) flying as ASCOT 9201.