King George VI is set to pass through Walmington-on-Sea by train, and the platoon is to provide the guard of honour.

Jones is smartening up Wilson in the vicar's office, getting ready to go to the station for a special parade, at which Mainwaring will open some sealed orders.

Pike arrives, insisting it is his turn to carry the Tommy gun, and accidentally knocks the sleeping tablets off the desk and onto the floor, breaking the bottle.

He comes out and gathers the platoon round him, then quietly reveals that King George VI will shortly be passing through the station in the Royal Train, which has been disguised.

The platoon practise presenting arms, then the station master and ticket collector arrive, flustered, and rush to get properly dressed.

Pike tells Mainwaring he can drive it, so whilst the station master is on the phone, the platoon climb into the cab and set off.

In the engine cab, Pike announces to Mainwaring that, because of the absence of the brake wheel, he is unable to stop the train, starting a panic among the men.