British kids movie from the 80s…?

There’s a kids movie (British I believe) from the 70s or 80s I’m trying to track down. I saw this in the early 80s on TV.  The main character is a boy who fell asleep in a pile of leaves and has a dream about rescuing/freeing children who are slaves underground.  There are these crazy creatures that I can only describe as wet-noodle monsters, literally!  Might anyone remember this movie?  Thanks in advance!


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