How to stop this guy from parking across our drive

Just go knock on the door and say hi I’m such and such we’ve just moved in and we can’t get our car out any chance you can move your car thanks lol did you not watch Corrie don’t judge a person by their looks he’s probably just a big teddy bear at heart.

I would go and knock on his door and politely ask him to move his car to enable you to exit your drive. Don't be confrontational though.
In future, get your own vehicle out into the road as soon as you are up in the morning and leave it there all day, he will soon get the message.

You are going to have to speak to him regardless of his size. He's blocking you in. Introduce yourself first. Be polite and ask him to move his car please as you need to get out. I had a similar issue with someone blocking me in (a grandma at the house opposite) The first time I was friendly and polite. The second time I was stone faced. It's never happened since. Good luck.

Okay! I know I need to put my big pants on lol but my worry is, is he going to keep on doing it and can I simply ask him not to do it again? Driving me insane why can't they just use their heads.

Perhaps the previous owner had let this person park there and he hasn't noticed new people have moved in.
As long as you are polite and tell him you need to get your car out of your drive, I can't see any reason why he should be aggressive.
Just do it now!!

You really have three options.
1. Ask him not to park there.
2. Notify the police. Get photos, dates and times so you can prove it.
3. Put up with the inconvenience.

If you are too scared to do (1) and unwilling to do (2), then (3) is all that is left.

Big girl pants and knock on the door, just ask politely. No need to fall out!