Stanley Tucci was the Director of a film, Final Portrait (released in 2017), starring Armie Hammer, Geoffrey Rush and Tony Shalhoub, filmed literally opposite my office in Bermondsey Street, SE1. They were there for a couple of days and I watched from the window of my office as filming went on (period film, with the usual traffic squeezing by). Walked to the post box and all three of the above stepped out of one of the local restaurants into my path.
Audience for Graham Norton a couple of times, Kumars at No 42, Paul O'Grady, Loose Women, couple of Andrew Lloyd Webber things including the Find A Joseph final show.
I was a "Judge" on a pilot of a Strictly Come Dancing/Eurovision crossover show which went nowhere, filmed at BBC Centre. I think it was 2009?
My boyfriend at the time saw a bit of the 1983 cult(ish) film Party Party being filmed, released in 1983 - he died that year and I always think of him watching the scene when it's (rarely) on.