Many, many years ago I was handed a formation of several French military aircraft just north of The Wash on a northerly heading. After the usual chat about Radar Control etc. I enquired "what is your next turning point or destination?" to which the reply was "St Mawgan"!
I repeated the question thinking that my ears had failed to understand the French accent ... they had heard perfectly well! The leader readily accepted a SW heading and was happy to resume his own navigation.
It transpired that the aircraft had been given a radar heading for deconfliction somewhere south of London ... and then forgotten at controller change over!!
I believe they landed safely at St Mawgan, if a little short on fuel!