The premise is a small boy called Rufus who finds a friend who is a small pig-like creature with a small elephant's trunk that falls through time. Flook is capable of changing shape, but does so less as the years go by.
There are some lovely touches. Fred Teeth is the Preservative Candidate (Ted Heath) and Mr Muckybrass (where there's muck there's brass) is of course Harold Wilson. Other politicians of the day are mercilessly caricatured in Trog's inimitable style. Margaret of Finchley is a comely wench in "Flook and the Peasant's Revolt"...
Even the Borgias are parodied, with Lucretia Bodger the witch flying around on her vacuum cleaner and Bodger himself the typical thick villain with a likeable dishonesty about him.
There are some books of the strip cartoons although they may well be quite rare. There is also a rubber Flook toy that squeaks, and I had one once. I believe they sell for £10,000 so I'm not pleased that my Mum threw mine away!