The Piglet Files (1990)

While taking a walk, Peter Chapman and his wife, Sarah, are followed by two bungling spies, Dexter and Lewis, who find it difficult to take photos of their quarry. Peter, an Electronics Professor at the local Polytechnic, is then suddenly sacked from his seemingly secure job without warning - and with no reasonable explanation being given for this decision. Taken to MI5, he is made an offer he can't refuse - a job offer!