The Monster of Highgate Ponds (1961)

Like Michael Powell, Alberto Cavalcanti ended his illustrious career in British films following a sojourn abroad with a fantasy for the Children's Film Foundation. Inspired by the big surge in interest the Loch Ness Monster was currently enjoying, it features Rachel Clay (who shortly afterwards played a child that was cold to the touch in Losey's 'The Damned') as one of the kids presented with a dinosaur egg that after millions of years turns out to be still warm.

It demonstrates the film's grasp of science that although he's supposed to be a scientist himself, uncle Ronald Howard is neither surprised nor curious when a reptile's egg (let alone one millions of years old) proves to be warm in the first place. All concerned continue to take it in their stride when the egg then hatches into a cute little stop-motion dinosaur chick (this is a Halas & Bachelor production, after all); and none of the members of the public who see the fully grown monster driven through the streets of London tied to the back of a lorry (after an attempt by the usual pair of bungling crooks to steal it) seem particularly surprised or frightened either.