Driver's side wheel arch lower than passenger side

Hey guys, just noticed this morning that my rear driver side wheel arch is closer to the tyre than the passenger side by at least 10mm. Springs look ok but i can't really tell. Anybody else had this problem??
 
I though this the other day on the front thought it might be a snapped sprig. Is it on a completely even surface?
 
yeah, my driveway's pretty even, just parked her up on my mates drive and had another gander, same, i can fit nearly 5 full fingers in vertically on the passenger side and barely 3 and a half on the drivers side, so its a maybe a good 15mm of difference.
 
Tanks just under 3/4 full, even then it shouldn't effect the ride height. Ill have to put it in, I can hear a slight metal grinding when I turn corners coming from the same side. It's not so much of a grind, more like rubbing.