What happened when you complained to the landowner?What type of car park was this; residential, NHS, retail, supermarket? Is it a site that has come up on here before? It may be that there is useful information about the site on this forum, but the regulars can't help you if we don't know where it is.You haven't answered the question about whether the driver has or hasn't been identified. If they haven't, was the NTK PoFA compliant?
When you pay at supermarket fuel pumps
DON'T assume your landlord covers you
Incl £2ish sun cream & £1.50 disposable BBQs