As I'm can't afford to head out off road much at the moment, and have removed the ARB rear trackbar drop bracket & replaced it with one at the axle end, I no longer have a huge bolt that catches on the rear sway bar. So I put it back on yesterday.
No noticable difference to body roll, but I think I'm losing traction on the inside rear tyre a little more easily accelerating out of the top of the street onto the main road now. The ESP light flashes on more often, at least...
Oh yes, this is why I took it out in the first place. That notch is where the bolt was catching on it. The drop bracket was purchased with the OME 2" lift, by the PO & installed by ARB I believe...