Catweazle and Carrot go fishing and Carrot does not catch anything. Catweazle does, he has been using his sorcery. Fishing might be easy for him, eating a banana is slightly more difficult.
As for Sam he likes a flutter at the bookies but he does not realise that the sign to the gypsy next door on the betting shop door is there to dupe the vulnerable. After all Madam Rosa is married to the bookie.
Catweazle has the eye of time and can see the next winner. However Carrot's dad is not happy that his son is hanging around betting shops.
Hattie Jacques plays Madam Rosa and gets involved in a right carry on with Catweazle who certainly tells her that he knows what she has been up to.
I doubt such an episode would be shown on children's television nowadays. It might encourage online gambling, although you would need a sorcerer who can travel through time.