"It also helped that The Bill was shot around the most iconic buildings in London, so it helps if you've got Big Ben behind you.
"There were a lot of programmes around about detectives, but I think it retained its popularity because it was the first time that a production company made the writing about uniform officers.
"We were saying what life was like for policemen, good or bad. It was a wonderful time.
"I did it for 25 years of the 26 years that it was on, and would quite happily still be on it if it was still running. I celebrated my 40th and 50th birthdays on the show, and not many people can say they've done that."
During its peak, The Bill was shown in 36 countries around the world, and nowhere more popular than in Australia.
"I love Australia and have been there many times. When The Bill was at its height Australia almost came to a halt when it was on over there.
"We did a lot of promotional tours to Australia while The Bill was on, probably eight or nine trips. And when my autobiography On The Beat came out it almost sold more in Australia than it did here in the UK."
"And I still get stopped by serving officers who say they saw me on The Bill when they were kids and were inspired to join the police."
Graham said he was first inspired to become an actor at the age of eight during regular visits to watch Saturday morning cinema.
"You watched a major with John Wayne or Humphrey Bogart in it, and then a B-movie with someone like Jack Hawkins. I just loved British black and white movies and decided I wanted to do that.
"My dad wanted me to do something practical, although I was only ever good at English and sport at school.
"But I also used to be a member of St John Ambulance when I was a kid so I started working at hospitals after leaving school at 16.
"I trained as an orthopaedic technician but it was all just a vehicle for me. So, at the age of 21, I said to my dad I now have this career behind me so can I go off and try acting?
"He agreed and I ended up as a Butlins Redcoat for one season and that got me started in the profession."
"I've done a lot of pantomime, but for the last two years I've been doing White Christmas, the Irving Berlin musical. And I have also done Scrooge. In fact, Scrooge would rate as number one out of those 36.
"Unfortunately I started out in panto as Jack and Aladdin, but as you get older you become King Rat or Abanazar, or Fleshcreep which is really who I'm playing in Jack and the Beanstalk.
"The villain's got to be a villain and that's why I like doing it. Apart from the Dame you are the only character who gets to play with the audience, and that's what I adore. So it's good to be back in panto."
Before getting to Lichfield, Graham will be appearing in a two-person play called You're Never Too Old, opposite "the lovely" Diane Keen.
"I am playing an alcoholic so a bit of a change from panto. It will be going around the country and ends in Eastbourne just a couple of days before I start in Jack in the Beanstalk.
"I finish in the play and then get one day off to travel up here to Lichfield. But I'm delighted to still be busy. I guess I'm a bit of a work alcoholic."
Tickets for Jack and the Beanstalk, priced from £12.50 for children and £21.50 for adults, are available by visiting www.lichfieldgarrick.com or calling the box office on 01543 412121.