According to RT online listings, it's His Bobness's Theme Time on R2 at that time on R2 (or it would show that if the page didn't. irritatingly snap back to the default making you have to arse about looking for the 4 March page in the schedule).

No sign of Mr Colyer (or is it Collyer? Google is in two equally divided minds on this).

Of rather more contemporary musical relevance, at the end of this morning's Today on R4 (it's not up on the site yet) there was a piece on the remarkable revival of the Denby Dale Brass Band by its one surviving member of the 1947 lineup.