Jerome the Dome.
Early 90s. Linton, piloty student-type chap, late night calls to Radio York. Usually pissed-up. Far funnier and wittier than incumbent DJ on the night shift. Held court on anything ranging from the situation in the Middle East to the colour of Sherpa Tensing's trousers.
I never heard the broadcasts, but know him from later. A thoroughly amusingly and nice fella.
I don't actually 'remember when', but somebody told me about it.