As I understand it if a vehicle doesn't have a current road tax disc on it, it can't be parked on the highway. Also there is no offence of parking on the pavement but there is an offence of obstruction. So if you're blocking the pavement in a way that forces pedestrians to step in the roadway to get past, you're in the wrong again. Therefore if you have parked across the dropped kerb, you are preventing people with pushchairs or wheelchairs from using that access onto the pavement.
I think even if it has a sorn on it, you have to have it on private land as Ethel says.
Can't you move whatever is taking up the space on your drive and move your sorn vehicle there, completely off the road and footway? Even though you're too late to benefit from this now, it may help to stop them getting you again.