I never knew about The Goodies doing a six episode Billy Bunter radio play in 1993. This would have been in the year 10 BMT (10 years after Banana Man started - Banana Man Time)

Each play goes for about 15 minutes.

One of Bill Oddie's best books is a Billy Bunter one as per https://www.express.co.uk/entertainment/books/820053/Bill-Oddie-The-Goodies-host-favourite-books

There is :

Bunter the Hero (13-07-1993)
Billy Bunter Afloat (20-07-1993)
Billy Bunter on Trial (27-07-1993)
Bunter in Brazil (03-08-1993)
Bunters Night Out (10-08-1993)
Chunkleys Stores (17-08-1993)

I came across them via the following link where you can listen to the episodes if you haven't heard them before.

https://www.friardale.co.uk/Television%20and%20Radio/Television%20and%20Radio.htm

On the page is also a link to an episode of I'm Sorry, I'll Read That Again featuring Greyfriars.