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

Sid has persuaded Hancock to make a dramatic film which the BBC have agreed to broadcast. But Hancock is worried; after all, when shooting started Sid's production company didn't even have a movie camera.

Hancock discovers that his extremely rich grandfather is very ill in hospital in Australia. Sid, expecting a large bequest, hurries to Australia masquerading as Hancock, but the old man has no money left. Meanwhile, back in the UK, Sid's grandfather falls dangerously ill in prison.

Hancock has been in a production of 'The Desert Song' but when it closes prematurely Hancock and Sid escape with only their costumes. Dressed as an Indian Maharajah, Hancock is mistaken for a genuine visiting Maharajah and ends up addressing a meeting but has to flee again.

Hancock has been watching the last episode of the horror serial 'Quatermass & The Pit' and is now in a very nervous state. When he discovers an unknown object in his garden, Sid thinks it's an unexploded bomb and calls in the Bomb Squad. But Hancock is convinced it's an extra-terrestrial craft.

Hancock meets a girl at an upper class party. He believes that she has money and Sid tells her that Hancock has money, so a marriage is rapidly arranged. But all is not as it seems.

The local council decide not to hold a Miss East Cheam contest because of the low standard of entrants the previous year. Instead they decide to hold a Mr East Cheam contest - Hancock and Sid enter and both expect to win.

Hancock agrees to attend an identity parade at the local Police station. But when he is mistakenly picked out by three witnesses he decides to prove his innocence by recreating the crime.

The tree in Hancock's garden is threatened with felling to make way for a lamp-post and because it is a danger to passing buses. He is incensed and organises a protest march to Downing Street to try to save it.

Hancock and Sid return from holiday to discover that Sid has failed to cancel any deliveries and has left every electrical appliance in the house on. Hancock decides that in order to make ends meet he and Sid must go on an economy drive. But Hancock soon encounters difficulties in the local self service café, and the stairs at home prove problematic as well.

Sid asks Hancock to lend him the money to open a fish and chip shop but Hancock refuses. Sid tells Hancock that he'll get the money somehow, but how will he do it? Hancock believes that Sid is planning to murder him, but Sid is convinced that his own life is in danger.

Hancock has had no success with the ladies so he decides to enrol in a charm school course, and he dreams about the outcome. But when he leaves the school the reality is a little different.