I was Terry Pratchett's gofer at an event once, quite early in his career.
I have met and chatted with Prof Ron Hutton a couple of times.
I ferried Portillo across a river for one of his shows - and was briefly featured as a result. He was an arrogant git.
Others would include Roy Hudd, Tony Benn, Swampy, Chris Packham and probably a couple of others.