Mystery man discovered in gardens

Trebinshun has a long, distinguished history and a big garden, but even we were surprised to discover this gentleman in the far corner last week.  He seems to speak little English (perhaps he got lost on his first day, before the training started) and judging by his hairstyle and moustache we think he has been there since about 1976, possibly even earlier. Does anyone recognise him? Click "read more" to view the image.