it was a kids programme and i think it had 2 boys and 2 girls in a victorian house and at the bottom of the garden was a sandpit and a friendly monster used to come out of the sandpit. What was the name? think it started return of the?
"The Phoenix and the Carpet" or "The Return of the Psammead" (the Psammead was the creature). It could also be "Five Children and It". All based on E. Nesbit books, I think "The Return..." may have been a BBC-created sequel while the other two were based on actual novels.