I live near a large school - when they are picking their children up they just park anywhere (even on front of peoples drives). Once or twice i have gone out to them (when my daughter needs to get off the drive). I have been given loads of abuse and told to wait - one man showed me his disabled badge and shouted abuse at me - so now i can't be bothered going out - it's too mush hassle. I phoned the police and they told me to take their numbers and phone the trafiic wardens. I phoned the traffic wardens and they said although it is illegal, they cannot come out to book these people or it will look like victimisation toward the parents - so i can't in. My local councillor is a load of crap and so are the local council (Shaw and Crompton).
Not only do they park in front of my drive, but our road as a parking ban between the hours of 8am and 6pm (they are parking between 3 an 4pm). So it's a double whammy, but noone will do anything.
If you hit them over the head with a bat then i am sure you will be arrested and charged with sct18 - but i would not advise that.