Thank you for the info, Minerva!
If there's a catalog# on the combo I'd be glad if you could post it.
Because the intro theme sounded familiar to me I had compared it to other recordings of Enid Blyton audio books/dramas I have. And since it was the same theme that was used for "The Mystery Of The Burnt Cottage" & "The Mystery Of The Strange Messages" (both uploaded
here by Matthew Roberts), I thought "The Circus of Adventure" might have been released by the same publisher (World Wide Audio).
Nevertheless I think many EB audio books/dramas were released by several different publishers, f.i. "The Ship Of Adventure" (read by Roger Blake and Elizabeth Lindsay) was published by
World Wide Audio as well as by
HarperCollins Audio.
Btw: Unfortunately the previously uploaded recording of "The Ship Of Adventure" (read by Roger Blake and Elizabet Lindsay) is incomplete; it's interrupted after about 50 (of 69) minutes.