The Angels' Share, Loach's latest production, is currently being shot at various locations in the cityand across Scotland. The storyline centres on the antics of a group of young people given one last chance to stay out of trouble and out of jail.
Scenes show the characters captured on CCTV camera and for authenticity, Loach decided he needed the real thing, so he hired a mobile CCTV van from Glasgow Community & Safety Services (GCSS).
Loach is a champion of unknown actors including Martin Compston who shot to fame in Sweet Sixteen. The director could also be about to set another newcomer on the road to stardom. He recently advertised for a "sparky" 19 to 26-year-old girl with a Glasgow accent to appear in The Angels' Share.
However, the 74-year-old also realised he needed a discreet, dependable and eagle-eyed law enforcer for a supporting role and called GCSS. The mobile CCTV van's time on location will not detract from the service given to the public as it would not normally be operational at that time.
Filming will take place over 10 hours and the fee earned during the hire will be ploughed back into making Glasgow Safer, Cleaner and Better. A member of the GCSS Marketing Team will accompany the van which will not appear in the movie itself - only the footage it shoots is destined for the big screen.
A GCSS spokeswoman said: "This request was slightly unusual to say the least. We don't normally get phone calls asking if our vans can appear in movies.
"But we were delighted to help out because we were still able to deploy the same number of vans into Glasgow's communities as usual.
"Now we're just hoping that the van doesn't get any airs and graces after rubbing shoulders with the stars! It will be straight back to its day job when filming has finished."
Glasgow Community & Safety Services has 18 mobile CCTV vans which patrol city communities to capture footage of anyone committing antisocial behaviour. Their presence has proved an effective deterrent to crime and youth disorder and footage can be used as evidence in court when an individual is prosecuted.
Although none of the GCSS CCTV vans have been used in a movie before, the service's CCTV monitoring centre at Blochairn was used as a location in the 2006 film Red Road directed by Andrea Arnold.
The Angels' Share is written by Paul Laverty and Loach's previous movies include Kes, Ae Fond Kiss, Cathy Come Home, Carla's Song and My Name is Joe starring Peter Mullan.