Gary desperately needs more wartime five pound notes, but Mrs. Flanagan, Ron's new boss at the printing works, won't let the staff do private work. Desperately short of cash, Gary tries to use his knowledge of the future to bet on certainties at the 1940s race track with an illegal bookmaker. Meanwhile, in 1998, Ron is arrested for counterfeiting white fivers.

In the present day, Yvonne's career is going soaring high, and so is she, to multiple locations across the world every week. Meanwhile, while out for dinner with Phoebe in 1944, Gary' discovers his assumed identity as a secret agent has drawn the attention of MI5. In an effort to keep himself from a short meeting with a firing squad, Gary agrees to go on a secret mission to the Isle of Wight.

It doesn't take long fro Gary to realise that MI5 have tricked him, he's not on the Isle of Wight, he's stuck behind enemy lines in France. As the severity of the situation dawns on him, the Gestapo rapidly begin to close in, and Gary's survival is entirely reliant on the loyalty of a French double-agent named Celeste. In 1998, Ron is recruited by Yvonne to escort a a statuesque fashion model to the launch of a new Nature Boy product, but things don't quite go to plan.