I changed the bushes this year (for PU jobbies). When I removed the old one the "stoppers" for want of a better word on the roll bar disintegrated. Now the bar keeps sliding across and coming into contact with the drop links.

Any idea how I can stop my anti-roll bar sliding around?

You could try slitting a couple of small lengths of overflow pipe or wiring conduit (both can be had from Wickes or B&Q) and clamp them in place with a hose clip. You may have to split the pipe/conduit completely into two but the hose clip should still hold it in place. The clip will need to be really tight to stand any chance of holding them in place.

Don't be tempted to weld a stop to the ARB as that could lead to it fracturing. The original "stoppers" are a very hard plastic and appear to be glued in place.