I see holy vehm reasoning but be very careful when getting the police involved in anything to do with bailiffs!
I was in a very similar position, and the bailiffs laughed in my face when I showed him the notice. Then the other NOTICE of implied right of access he ripped up in front of me.
So I called the police and the police of course took the side of the bailiff (which I know now they shouldn't have done)
Anyway my advice for dealing with bailiffs is:
Never answer the door
Never get into communication with them.
Park your car in a different area until he goes if possible.
For a PCN it sounds like its got a bit out of hand.
Have you read about the different types of bailiffs?
There are lots of useful links on here. Make sure yiu know where yiu stand.
I've had success with a bailiff for my council tax, by following the above and being persistent but peaceful with letters.
Don't get the policy men involved they will just make things worse.
That's my pennies worth