The insurer of the van, assuming there was one. My son had a similar with his first ever new and slightly flash car - an Audi TT when they first came out. Parked it day 2 in a vertical to the kerb bay in London and went into a cafe. Sat down and heard a crunch as an 80 year old lady drove into the back of it. She hadnt bothered to renew her licence and was driving on her sons company insurance. Felt sorry for the lad - early 20s, decent job in London, first nice car and that happens.
I was even more pi55ed off when Elephant honoured his protected NCB on renewal and doubled his gross premium on the excuse he must be accident prone. Most insurance companies are fair but there are crooks like Elephant.