From what I read earlier, the handoff from Belgium (Eurocontrol) disappeared into the ether as they crossed the North Sea.
The plane was apparently a private aircraft from Nuremberg, Germany, according to flight trackers.
The RAF has since released a statement, saying: “QRA Typhoon aircraft were launched this afternoon from RAF Coningsby to intercept a civilian aircraft that had lost communications; subsequently, communications were re-established, the aircraft was intercepted and safely escorted to Stansted Airport.
IG