Yes. I have a "good friend" that was in the RAF at the time. The gas masks issued to the civilian population were, in reality, not intended to protect the British from German mustard gas, as they were told, but to protect them while the Brits gassed the Krauts if they landed on the Island.
Furthermore, the Brits had built oil pipelines into either end of the Channel with the intention of flooding the invasion crossing with petroleum, and lighting it on fire with the German invaders trapped in the oceanic inferno.
In short, the concept of the show is entertaining, but highly unlikely. Winston was not going to let Jerry on his Island.