Aircraft was en-route to EGSS and went "quiet" whilst on a Madrid frequency. Apparently the crew only realised "something was wrong" somewhere over Normandie when they noticed the Mirage alongside. That convinced them to check in with Brest p.d.q. The Mirage kept them company until the French UIR boundary at FAWBO before peeling off and returning south.
Red faces and brown trousers???
Remember - it's good to talk !!!