I'm struggling to understand what actual negative impact it has upon your life
Because if it happens regularly enough, and usually does if it is a school street, it means every time you have to get your car out, maybe to pick up your own children you have to ask and wait for them to move.
Or if you are trying to get in, you have to block traffic further, get out of your car, knock on their window, have a conversation and then wait til they have left, then get into your drive. Meanwhile, there is a line up of other people waiting to drive along the street.
If they park and leave the car, you have to find them. I have had to pay tradespeople extra because they were blocked in (and believe it or not had someone on MN tell me how lucky I am to afford a plumber!!!), miss a doctor's appointment for my sick child, amongst numerous other 'negative impacts' because someone who regularly parked and waited, decided to this time actually leave the car.
If they are complete knobs, as I have had, they insist that you wait for a 'moment' til they are ready to leave.
After a while, you hear every excuse and if it is double yellow lines, it actually doesn't matter. They are usually there for a reason, and that is usually a safety reason.
OP has stated there are double yellow lines. There is no waiting allowed or parking as per the Highway Code .
So, No. OP. Now I have read your other posts, YANBU