I either run of cycle to work every day and I go past a specific premises everyday and their vans park nose to tail all along the verge, pavement and block pavement access along a public right of way and main cycle route with single and double yellow lines the length of the section in question.
I've contacted local parking enforcement, the council's 'ActionLine', council employees inc. one who's a CTC rep, local councilor, the local police and the management of the company myself in person and all I've seen is 2 parking tickets.
I've lost count of the number of times I've struggled to get along the pavement, nearly got knocked over nearly stepping in to the road with zero visibility to find a car or HGV heading for me and been pulled out on when on my bike by one of their vehicles as they themselves have next to no visibility coming out of their yard 'cos of their stupid parking.
I've just about given up trying to get anything sorted via proper channels. I'm at the stage where I just want to start pulling mirrors off and running over bonnets. I wish I had the skills to hop my bike across their bonnets too.
none of the official routes I've contacted so far give a toss, the majority don't even reply at all.
Rant over! [Takes a deep breath]
Point is, in my experience it's a waste of your time and effort to report it
Rip the mirror off and maybe they’ll think again next time!