Guy's cousin was actor Simon Cadell (1950-1996).
Guy speaks German and French.
In a 2007 interview with magazine Humo about his role in Allo! Allo!, he mistakenly thought it was called homo.
Guy has voiced in 4 Star Wars video games:
Star Wars: Jedi Knight II - Jedi Outcast (2002)
Star Wars: Galactic Battlegrounds (2001)
Star Wars: Force Commander (2000)
Star Wars: TIE Fighter (1995)
Guy Siner: (When asked what made 'Allo 'Allo so successful) If I knew, I'd be rich... If I knew, I would have written the next one!
Guy Siner: (When asked if he got to meet Johnny Depp) No, that was a dummy I was working with. They had a blow-up Johnny Depp on my scene (laughs). No, I've worked with Johnny Depp, he's great!
Guy Siner: There are fans who seriously think I live in Bavaria, in the Alps somewhere and that I blow a horn and eat a lot of cheese.
Guy Siner: (When asked if he considers himself to be American or English) I consider myself to be 'haff and hawf'. My father was American. That's the haff. My mother is English – the hawf. I feel equally at home in either country.