I hate people that park across 2 spaces its just inconsiderate, and dont even get me started on people who park in disabled/child parking spaces. But I like everyone else like to look after my car. Just park as close to a wall or barrier as possible, leaving enough room on the drivers side to open the door. Let the passenger (if you have one) get out before you reverse in. If this is not an option, park under a visible cctv camera, then if damage occurs, catch the feckers! :tu:
Apart from weekends the parent/child and disabled spaces at the Waitrose I use are virtually empty [I wouldn't use them then anyway]. In fact I now don't use them at any time, but would just like to say this; usually on a weekday afternoon there might be 3 cars in about 40 of these spaces. What harm can it do to park up for 20 minutes? Some of the people I've had pulling me about parking in the parent/child spaces are so "precious" about it, it makes me vomit

OK so you've got kids, big deal!