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

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

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

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

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

No, I’m at full height, I’m in the studio, I can actually catch actors by the eye, it’s fantastic.

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

Dick Mills was in charge of sound effects and all the rest then, and he put the voice through a ring modulator or whatever gizmos he’d got at the time to make it sound a little more electronic.