A garage have been driving my other half's car, it was parked on double yellows for 30 minutes, the garage haven't been much help saying it was just a test drive, it only went in for a suspension bush, they had car from 930 till 1230, and it seems there were using the car most of the time, what should I do, it's all on camera

Find out who's at the top. Chairman/boss & relay the story to them & ask what they intend to do. If you don't get any satisfaction, go to the press.

Cheers

Years ago when I worked in the oil industry as a welder, I had an old Triumph Acclaim for going back & forth to the oil yard. Anyway MOT time & it required some work. Dropped the car off at the garage I used back in the day & made my way to the bus stop off home. Imagine my surprise when standing there for 15mins when my car passed the bus stop with two strange men inside.

What the f... I thought. Back next day, all work carried out as well as some welding, fresh ticket for another year, car cleaned & I was happy. Didn't bother asking for details as it was just a banger. No idea who the guys were.