And now for the really useful bit of information, it's called "Town with Nicholas Crane", which should help you to actually find it on the iplayer

It was on BBC2 at 9pm earlier tonight, 4th June.
My clever TV recorder (MythTV,
www.mythtv.org) recorded it for me even though I didn't know about it, simply because it knows I like RL and records anything with an RL reference in the listing.