A few years ago a guy called Steve Sullivan started a Kickstarter page for a documentary film called "Being Frank". It's the life story of Chris Sievey, the man behind the Frank Sidebottom mask. He was asking for donations for the film and along with Martin Sievey (Chris' brother) they put together some packages for donators. Chris Sievey's cellar was apparently full of stuff which he had collected over the years. They were clearing it and some of the stuff went to donators. I've been a Sidebottom fan since I was a kid so wanted to see the film. I donated a few quid and they sent me a "I should be so lucky" goodie bag. I was so happy when it arrived and saw who was inside...
The film is still in production, if you contact them Martin may still have some of his stuff? Sidebottom was a Star Wars fanatic. Hope the film comes out Soon.