Cheshire police officers are the stars of the next episode of a prime time Channel 4 documentary which follows what happens from the moment a call is placed to 999 – the world’s oldest emergency call service.

The force will make its debut appearance on 999: What’s Your Emergency? on Monday (July 11), in an instalment of the eye-opening show which will shine a spotlight on the devastating effects of so-called ‘legal highs’ and the strain their use places on already stretched emergency services.

The number of people seeking treatment because of new psychoactive substances has tripled in the last year.

Warrington officer PC Karl Dickon was one of eight sent to detain a male in his 20s acting erratically after taking a cocktail of illegal and legal drugs.

“On the legal highs they just turn into monsters,” he said.

“You’re dealing with someone with superhuman strength, they don’t feel pain, it’s like a zombie.”

The episode will also feature a grandfather who suffers a bad reaction to legal highs he purchased from the internet and a young woman who seeks sanctuary in a kebab shop after a party where the drugs were taken turned violent.

The next episode of 999: What’s Your Emergency? will air at 9pm on Monday (July 11).