Always best to check with your 'friendly' planning department! Also, look for a precedent. Has anyone else done it in your road? You'll be digging new footings for the front wall and using a lightweight lintel of some kind, so it's fairly technical in that respect. I think it'll certainly need to be checked by building regs, even if it falls under permitted development.
Alternatively, you could cover it all up with a tarp and secretly move the wall forward, or maybe just cut a car bonnet shaped hole in the door?
Good luck with your project!
Olly