Sick to the back teeth of neighbours visitors parking right in front of my drive so I can't leave or get on my drive without knocking and 'asking' them to move their vehicles! They don't see a 'problem' with this and just expect me to be amicable and knock and they will 'happily' move for me!!
I, however, do not wish to KNOCK every time I want to leave/enter my own driveway, and don't see why I have to ask 'permission' to do so, if you know what I mean!!!!
I don't want to fall out with anyone but this is really effing me off!! The lazy f'ckers don't live here and can't be assed to park a bit further away and use the legs they were born with!! Can you tell I'm angry!! 
Any ideas on how to resolve this issue? (Preferably amicably as I do have to live here).