But here I am today recording this and I'm in the studio with all the others on a clean mic. It's extraordinary, the actor's found a way of doing it for himself.

It was just at the end of the golden era of BBC comedy, which was fantastic.

Martin Jarvis was to have played the part originally but I think I had longer hair or something, I know not.

It couldn't sound like a dog, because K9 isn't a dog, but I made it sound as mechanical as possible.

But here I am today recording this and I'm in the studio with all the others on a clean mic. It's extraordinary, the actor's found a way of doing it for himself.

I was lucky enough myself to have been in Dad's Army for an episode.

Got through it without fluffing, that's the main thing any actor can hope for.