The Early shifts is widely credited with being the first episode of On the Buses.
But, I'm sure i've seen an episode where Arthur is a lodger in the butler household and accidently gets intro the wrong bed, Olive's bed. Olive screams, the whole family come in and declare to Arthur, You'll have to marry her now.
That is how Arthur ended up being wedded to Olive.
Does anyone know which episode that was and if its available?