Parked up in a small market town today, I drive a Ford Custom van as it is a wheelchair adapted vehicle as my child is a wheelchair user and needs to travel in his chair. I parked at the end of a roadside parking bay with my rear wheels just on the double yellows so I could access the ramp to get the small person in and out of the car without the risk of being boxed in (the ramp needs 3m to be able to lower it and get him in and out safely, there is a big sticker in the back window asking people to leave 3m behind the van so we can get access). Popped into a couple of shops, came back to find a car right behind me on the double yellows with no chance of getting the ramp down (even if I had pulled nose to tail to the car in front there wasn't enough space). There was a woman sat in the car so I spoke to her and explained that I needed access to get my little one in, she was apologetic but explained her husband had the keys so she couldn't move it. Instead she called him and asked him to come back, he did so but was incandescent with rage that he had to come back to move his car. I tried to explain but he couldn't, or wouldn't, see it from my side. His argument was that I should park in a blue badge space and not inconvenience others (I couldn't, the market was on in the market square which is a carpark for the other 6 days of the week). I don't think I was BU but he clearly did.