Flying from Cambridge to Elstree a week ago, were listening out on the Luton Approach frequency.
An agitated controller was urging an aircraft away from the Stansted runway centreline. Eventually the aircraft seemed to understand what was going on and got out of the zone.
A couple of minutes later a sheepish PIC came on air to apologise for the incursion.
Pilot: “Sorry about that – we are on an IMC training detail and thought we were at Royston and got a bit lost.”
ATC: “Well you failed that then didn’t you.”