The House star said he was considering signing up when he was just 16 but instead went to study at Cambridge University and found fame on comedy shows such as Blackadder.
Even so, the 51-year-old said his choice is not without regret because had he opted for a life in the police, he could have retired 16 years ago.
He told the Sunday Express: 'When I was 16 they were looking for me to serve in the colony. I became fixated on this romantic idea of working on the other side of the world and wearing a duffel coat and probably short trousers. I would have smoked a pipe, been acerbic and reunited young lovers. I even got the brochure and sure enough the uniforms were very smart and it was all shaping up well. Now I slightly regret not taking that course as in 2001 all these blokes in the Hong Kong police who would have been in my position would have been retiring at the age of 35.'