Speaking of great British radio shows, there were two comedy quiz shows that I listened to intermittently over the years since college, MY WORD & MY MUSIC, both panels of which were anchored by those two droll raconteurs, Frank Muir and Dennis Norden. Though they haven't been on the air for years, Public Radio used to play repeats of the shows on various outlets all the time. They were funded locally out here for years by David Hockney. Very witty and erudite.
My Word always ended with Muir and Norden having to give their versions of how famous phrases came into being, which usually resulted in outrageous puns as the punchline. One I remember was the origin of "Wait Till the Sun Shines, Nelly"...which became a very funny, long, convuluted story about a trip that Byron and Shelly were taking in Europe and finally as they were checking into a hotel Shelly brushed past a nun, whereupon Byron held him back and said, "Wait till the nun signs, Shelly."