What to do about an untaxed car in communal car park?

You can report it to the local council. Even though it's a private car park I believe that this still counts as public for the sake of removing a car. This is the [official link](https://www.gov.uk/report-abandoned-vehicle). From an RAC article: >If you suspect a vehicle has been abandoned, you’ll need to tell the appropriate local council. >To find which authority to report the car to, just enter your postcode into GOV.UK’s [report an abandoned vehicle ](https://www.gov.uk/report-abandoned-vehicle)tool. >It’s the responsibility of local councils and national park authorities to remove abandoned vehicles from >land in the open air >roads >This applies to private land and private roads too. >Before authorities remove a vehicle they must try to find the owner to give them seven days’ written notice to collect it. If the owner claims the vehicle and pays for removal and storage, the authorities must return the vehicle to them. >If the vehicle is dumped on private land, the authorities must give the landowner 15 days’ notice that they plan to move it. They can’t charge the landowner for the job but the authorities can refuse to remove the vehicle from land in the open air if expensive equipment is needed. I'm not sure if the DVLA will look at this as it's technically private land but if it's not been SORN'd then they may also want to do something. You can report an [untaxed vehicle here](https://www.gov.uk/report-untaxed-vehicle). Hope that helps.