It's kind of a parking one, although I am one of the parkers in this scenario!
Our village has very limited on-road parking. Our street has parking on one side only as it's not wide enough for both. Recently, as in about a year or 2 ago, a new house was built on the end of the road in an area where there was previously public amenities with no vehicle access from the street and a low wall the whole length of the side on the road. As in, there was parking along the whole side of the plot on the street along the wall.
The new house was built with a side entrance from the pavement, a front gate with parking inside the plot which has dropped kerb access, and has a front door which opens directly onto a small area running alongside the house beside the street with a low wall. The builders have put in an opening in this wall by the door, so you can walk straight in the door off the street however there is no pavement and it is historically a part of the street that is allocated to parking.
Since the house was occupied, every time someone parks there, in front of the front door but - importantly - NOT blocking their access to the door, or their side entrance, or their gate wide enough to drive their car it, the owners have been leaving a note on the cars. Every. flipping. time. It is titled 'polite note' and says please don't block the door.
The rest of us in the street think they are ridiculous, since a) the car doesn't block access to their door as you can't park too close to the wall anyway, otherwise the doors wouldn't open b) the road is designated as parking so - gasp - cars park there and c) they have 2 other accesses anyway.
They have become a bit of a joke tbh and today I lost the plot when I found another note on my car - some of the neighbours were opposite shaking their heads saying what are the homeowners playing at there is plenty of room etc etc. I had parked quite a way back, maybe with the nose only over a few inches of the gap in the all and in no way blocking any access - they could fit an elephant through the gap! I ripped up the note and threw it at their front door (not my finest moment I admit) but I am so fed up after more than a year of them thinking they have the right to stop cars parking on the street. I know the builder who did the house by reputation and I very much doubt they bothered to get the proper permission to grant pedestrian access from the side of the road and there is no kerb, dropped kerb etc that we are blocking. Surely you can't just decide to knock a hole in a wall alongside a road and then claim no parking?!
Does anyone know if there is any way of checking this? There are no 'proper' signs to say not to park there, and even when cars do they are not blocking the access anyway which is the weird bit?! Would it be in the planning on the local council? Or would it be the highways agency?
If they are in the right, then I will of course refrain from parking there although that would be a major pain in the arse.
And no I have no diagram although I might try and work something up after dinner if you're nice to me 
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