I just spoke to John Fowler from Wheels World, and he said my suspenion mods have no relation to the wheel bearings. I have Whiteline Flatout springs, camber bolts, whiteline sway bars, endlinks. My alignment isn't very aggressive either.

From what i know, usually the cause of this is kerb kissing, but i haven't hit any curbs. The only cause i can think of, is when someone went into the side of me, hitting my front left rim. But both sides need fixing, not just the left (according to Leigh).