Hi,
Not to give too much away but:
1. the film bears only a passing resemblance to the radio series, books TV or record. It's actually a more coherent whole...
2. it's worth waiting through the credits, no matter how much of a saddo that makes you appear. I only did it because I wanted to see if the title song was written by Eric Idle (no) and had a pleasant suprise.
Enjoy....

