Wasn't a US registered Cessna 182 by any chance ?? There was one causing havoc along the length of the UK yesterday !!
Was not a C18
5 by any chance? One N-reg passed trough here from the north cape heading for the UK via Tronheim/ENVA 3 days ago. He displayed somewhat "flexible" knowledge of our airspcace as well as minimum IFR altitudes in alpine terrain.
Made for a interesting shift!
Sounded like a Brit.