Hi Itsawelshthing
Sorry to hear you're having this problem with your neighbour, and hopefully you can resolve it easily by asking him politely to move.
Some years ago, we had a similar problem with our nextdoor neighbour with whom we had a shared drive. He regularly parked in front of our drive, thereby blocking us in, despite asking him to move his car.
His theory was that every time we needed to go out we would tell him, then he would happily move, he could not get his head around the fact that this did not suit us, he was a rather stubborn man.
We finally reported him to the police when one day we could not get out to do early morning shopping. I think he was shocked when the police turned up on his doorstep, it never happened again!
Fortunately he moved a few years later and we had no such problem with the new neighbours.
I hope you don't have to do this, but as a last resort, you may need to.
Good luck and I hope you can enjoy your new home after this initial obstacle.