I want to go to the Overworld (music)

In the early 70's there was a children's program called 'Little Big Time' hosted by the late great Freddie Garrity. This music comes from 'Oliver in the Overworld', which was part of the show (I don't know much about it I'm afraid). I grew up to this fun album and have just rediscovered it.
Sadly, of course, the videos of this series have been lost, so there are no moving pitures. But the music still survives.