You realise he has just as much right to park their as yourself yes? there are no yellow lines or no signs dictating disabled parking only. If because of your health you require a private parking space outside your mother property you need to inform your local council and pay for a disabled spot to be put in.
I think the van driver's intentions are good. Only thing I disagree with him is the way he pulled alongside the riders. Unfortunately where I live a lot of riders are nowhere near as passive as these and unlike the author would never accept they were in the wrong. Takes a big man to admit he was wrong and the rider did just that.
Sweet ride