In order to film the fifth series of Armstrong and Miller Alexander set up a production company with comedy partner Ben Miller to handle it. This was due to an issue over DVD royalties for the fourth series. It is called Toff.
In July 2008, Alexander started doing Podcasts with comedy partner Ben Miller, as Cultural Commentators for Times Online (website for The Times broadsheet in the UK).
Alexander garnered something of a reputation for his role as Harry Fitzgibbon-Sims in the series of advertisements for Pimms, in 2008.
Alexander was in the Cambridge Footlights, abandoning his time as a chorister to become more involved in comedy.
Alexander studied English at Trinity Hall, Cambridge.
Alexander's stag weekend involved clubbing in Taunton, cake-icing, and go-karting.
The two Edinburgh Fringe shows he took part in with Ben Miller were called Bare Naked Fighting (1994) and The Quality Shag (1996).
Alexander Armstrong teamed up with comedy partner Ben Miller in 1992 after performing together at the Gate Theatre in London.
Alexander's cousin is actress Imogen Stubbs.
Alexander is 6'3".
(on his love for Pimms)
Alexander: When I was very young my brother, sister and I would jokingly ask our parents for some at Christmas and they would play up to it by decanting brown-coloured lemonade into an empty Pimm's bottle. We would knock this back with all the fruit and so on and think ourselves frightfully grown-up.
(on his character in "Life Begins").
Alexander: I don't think there's anything of me in Phil. He looks like me and sounds like me and he'll say things in the way that I'll say things. But no, he's very much not like me.
(on not being made permanent host of "Have I Got News for You").
Alexander: I don't blame anyone. In fact, I suppose I should be grateful - I was never put in the position where I might have become the person who 'brought the programme down'.