i'm unsure how it works with disability cars but if she has to pay for stuff like tyres etc then she will soon start moving it if it costs money but be careful of her putting a camera to watch etc or revenge tactics.

You could always get a complete rustbucket cheap and just use it to park next to and dent the hell out of her car then move it away for a week or two. Just a shame you can't pick up a cheap car with 12 months tax and leave it in between two spots till you need one spot.

depends how far you want to go tbh without getting into serious trouble. The easy route is online just reporting her for bedroom trading on ebay,benefit cheating etc, she will get called in to answer for this.

If she keeps on with it then black electrical tape is your friend, just adjust one or two letters on her numberplates, it will ping up on any cameras around (I think you live stevenage area) and will most likely get her pulled over by police and not only questioned why the insurance isn't showing up on the new numberplates but also if she's done it to avoid speeding fines/leaving petrol stations without paying. Or just turn one of the numberplates upside down btdt before just make sure its on the end they would least check i.e. if they get out and walk behind the car do the front.