Hancock has been on holiday abroad and he tells Sid of his exploits in which he foiled an international gang of smugglers.

Hancock dreams of becoming the great detective 'Sexton Hancock' and proceeds to unravel a complicated murder plot.

Sid has set up an amusement arcade, but when Hancock finds out he leads a campaign to have it closed down. Meanwhile, Hancock seeks election to the Council but when Sid's arcade is closed down he moves it to Hancock's house.

Hancock is told by the doctor he must get fit. But when Hancock takes an unwilling Sid on a hunting holiday to Scotland, they get snowed in.

Hancock takes on a new job as an air steward. But one of the passengers on his first flight is Sid who is on the run from the police, and the other passengers include four police officers looking for a bank robber.

Hancock, a junior clerk in a City office for 19 years, receives a promotion when his army friends, who met at a reunion, place large orders with the firm. However, they are all fraudulent orders and Sid has the takings.

Hancock needs to get to the top of the waiting list for a council house but to do this he needs a wife and four children. So he adopts Sid and four of his mates, but then he can't get rid of them.

Famous actor Jack Hawkins takes elocution lessons with Hancock and is reduced to being the leader of a rock-and-roll group.

Hancock becomes a lawyer but when he defends an obviously guilty Sid James in court he finds himself the subject of a guilty verdict.

Hancock takes up entering newspaper competitions as a full time job. When he wins a few competitions, he is foolish enough to trust Sid to look after the money.

Hancock buys a house from Sid but discovers that there's an airfield at the bottom of his garden. Returning to Sid dissatisfied, he is forced to try to sell the house himself but he has considerable difficulties.

Hancock presents his own variety show from the Television Theatre - but he has asked Sid to provide all the acts.