Jules Verne's Rocket to the Moon

In this British science fiction comedy, Phineas T. Barnum convinces his friends to invest their money in a project which will send the first space flight to the moon. They devise a plan to shoot their rocket from the side of a mountain in Wales, using a specially built gigantic gun barrel. But before the day of the launch, financial challenges and the work of spies and other individuals intent on sabotaging their mission, make it seem like their ambitious project is doomed.