Car parked outside my house by selfish neighbour

I live in nice quite close where most houses have their private driveways apart from myself and our next door neighbour, there are however three parking spaces outside the two houses without driveways.

My issue, the typical parking one, comes from one particular neighbour.  He has a car, his wife has a car and they've also got a son.  Yep, he has a car too.  As well as three cars they also have a driveway that is long enough for at least four cars to be parked on.  Despite having a large driveway, they insist on only having one car parked on it.  The mum parks outside their house in the road and the dad parks his car outside our house.

Now when I lived at home with the parents we also had three sometimes four cars and one long driveway, almost exactly the same as theirs.  But we had no issues with parking one car behind the other and simply moving cars around if another person wished to get out, as did the majority of our neighbours.  This family however does not believe in doing this and instead parks outside my house.

I know I have no right to park outside my house but surely out of neighbourhood courtesy you would not park outside someone's house when they have no driveway and your car doesn't move often for a week at a time?

I have raised this issue with the neighbour, only for him out of stubbornness and sheer single mindedness not to see my point.  Coming home with a boot full of shopping is often rather irritating having to carry it from the other end of the close, shutting the boot and locking the car on every walk to and fro.  This never happens with what I look upon as our neighbours space, as its outside their house I have the courtesy not to park there despite these issues!

...turning my front garden into a driveway

This is really starting to irritate me to the extent I'm looking at getting a dropped kerb put in and turning my front garden into a driveway, something which I don't particularly want to do or see why I should.

I understand there's three spaces outside our house, one which is normally taken up by a visitor, but they don't even see my point in having the car which doesn't move park in the drive and one of the others in the space so at least I have a chance of parking outside when they're out.

I will make sure that the next house I buy has a driveway to prevent issues like this!