I decided to become an actor because I was failing in school and I needed the credits.

So, they had this 40-odd year friendship with each other and with Mr Harwood. So, when I came on it Albert, Tom and Maggie were in the cast. But then Albert wasn't up for it, so he had to withdraw.

We're all a little nit autistic.

What makes divorce happen is that you can't be in the same space any more, for whatever reason - but the love stays. And that's the killer. That's where the vehemence and anger and rage comes from.

In terms of the stars, the only ones I cast were Billy Connolly and Pauline Collins. I was in Los Angeles working and a lot of this took place on the telephone. I'd met Maggie [Smith] once and I'd come back-stage, which I'm usually loathe to do because as an actor you don't want people coming back because you want to get home [laughs].

I knew that we had an obligation and that was to keep an energy in it and try to keep the audience interested. In fact, I asked some of the actors to take a look at His Girl Friday, a Howard Hawks film with Rosalind Russell and Cary Grant, because they talk over each other and there's a great energy.

I'd like to thank my parents for not practicing birth control.