Contact the transport police to see if they can request the footage from the car park operator. Alternatively, do a subject access data request on the car park operator requesting any information they have on you and your property, i.e. vehicle registration and date to assist in issuing civil proceedings against the person who committed a tort against you. You will hold them liable for damages sustained to your vehicle whilst they acted as bailee over your property, where you paid by way of ticket for the storage of your vehicle on their property. It might just prompt them to assist. You could also try raising a claim with the MIB: www.mib.org.uk/making-a-claim