You could report it to the council and police in case it has been reported as stolen, but if it's taxed and MOT'd it won't be classed as abandoned. If there are no parking restrictions the driver can park there until either the tax or MOT runs out if he wants to
my car was abandoned in a faraway town some years back, nobody there reported it and it was there for 6 months. my insurance meanwhile of course had already paid me out which I was then able to buy a new car.
Contact the police on 101, they'll have all the required information in order to do something about it - either they'll contact the registered keeper or pass the information on to the relevant agency.
That's how I've dealt with a similar situation before.