A lady called Maggie Percival has made available photos of when a group of people all dressed up like Group Green for a sci-fi convention years ago. :)

It's easy to spot Aiken Drum. Love the chap dressed up as Richard.

https://photos.google.com/share/AF1QipNy1Ub09KK3aYjs_cyw1Grldpk3fMO4HNQmmtj4RwyXeHmifeIawLXtF3Ug4k9ZjQ?key=QVlnOU1MS2R2Y1ozWEUtY1BwaUd2SHZscDd2Z25n