Keep an eye on the BBC channels with the cobwebs on 'em. It was broadcast a few months ago and given their predeliction for stuffing these highly-important digital channels with endless repeats dragged out of the Ark, I'm sure it'll crop up again and if you keep your DVD recorder ready, a DVD copy shall be yours.
Back in the day, a letter* to the Beeb asking about repeat times would produce a "no plans" form response. But it would also produce a follow-up letter some time later (often quite a long time later, when you'd forgotten all about it) saying: "due to demand.....<bollocks, bollocks, bollocks>.....is to be repeated, starting on <date> at <time>".
I wonder if that trick still works? Not holding my breath here though, that seems waaaaaay too public service oriented for the Beeb to have kept it up.
*An obsolete communications medium involving paper, crayons, little gummed pockets to put the paper in and small but extrinsically valuable labels to stick on them.