Colin Firth thinks actors should steer clear of Botox injections and plastic surgery.

The Mamma Mia! star told BBC Radio Five Live that it was ‘catastrophic’ for actors to consider cosmetic surgery because it would prevent them from expressing themselves properly.

“Your face is supposed to move if you’re going to act,” he told the station. “Why on earth would you take a violin and make the strings so that they don’t vibrate?

“Injecting something into your face so that it’s paralysed, or cutting bits of it up so that you take any signs of life out of it, is catastrophic if you’re going to express yourself in any way at all.”

But the 48-year-old actor, who is currently appearing in cinemas as hedonistic Lord Henry Wotton in the film Dorian Gray, isn’t completely against plastic surgery in principle. “I would do it tomorrow if I thought it would look good – but I haven’t seen anything I think really works that well,” he said.