Great! Glad to help. There's a lot of audio drama on the Beeb, also on R3 (the classical music station) that far fewer know of, and R4 Extra the internet channel. Good luck, and have some more links. :)

https://www.bbc.co.uk/programmes/b006tnwj R3 Drama Page

Two old multipart series I happen to remember, just to give an idea of past scope:

https://www.bbc.co.uk/programmes/b03nv05z Listening to the Dead - 5 part series.

http://www.bbc.co.uk/programmes/b07mxgxl Tracks - 9 part SciFi conspiracy thriller.