Illegal parking

Hi there is a local car business that keeps parking their customers' cars/vans on my street outside my house, so when i come home i can't park . they fill garnet road up with them, making a danger to life, as they obstruct anyone's vision when pulling out onto Garnet road. A a little lad as already been rushed to hospital regarding this. There very clever they park the cars outside my house or on my street after 5pm because they no with it been residents only parking, traffic wardens don't work after this, then round about 9.30am move them, so avoiding a parking ticket.i have left a note on there cars, and spoke to them, and they basically tell where to go. I think this is unfair as i and my neighbours have to apply for a parking permit each year , and this business is just parking anywhere with no regard to safety or mine or neighbours needs, there pick up truck loads and unloads at all hours during the the night as well. i do have cctv footage of them parking/moving early in the morning if required. I hope you can help as this is becoming unbearable and unsafe. my address is MR A JONES 30 OAKLEY TERRACE LS115HS 07597424757