Why bother.
The truth is a blue badge is only valid for parking on the street not on private land, so there is not much at all that can be done about it..
They could issue you an invoice or a notice but under law As the blue badge doesn’t apply they cannot chase you for that debt.. They can try but if you don’t pay no court in the land will uphold it.
Plus think about it what sort of person would park in one that doe’s not have a blue badge. So it’s not worth your while imo, as you never know, one day it might be the wrong person and you get hurt bad or even killed. over what exactly.. opening your mouth and policing the bays.. Most decent people don’t park in them.
Although i have asked a police car to move quite a few times and flashed my badge at him when no bays are empty.