Hmm. Just took a quick look and found that my left rear wheel sits higher up in the arch by half an inch than the right one. The shocks are definitely good and there's no noticeable difference in handling. There's no extra load on the left side that I know of.
Can the springs be of different height?

The right hand side has had the upper strut mount replaced (at least that's what I think the round plate with three boltpins is).

If I look real good I can see the difference from a few metres away as the left side of the rear is a little lower.

What's going on?