As said above it certainly was Dragon 55 outbound RAF Fairford, he was en-route to RAF Akrotiri and as my picture above shows it's a Senior Span configuration U-2 also.
It occurs at least once every swap over, London Military hand the U-2 off to Paris Radar; Paris informs the U-2 they won't work him and tell him to re-contact previous frequency.
London then (as with this time) contacts Paris and sorts out their clearance or if the clearance isn't sorted the U-2 has to re-route around France.
You can find info on the U-2 movements here:
RAF Fairford
Mike