DittonLou

I had the same issue on my Rapid, I replaced the rubber anti roll bar bushes with(Polybush) neoprene ones which after some time & in cold weather made the same noise as you have. The cure was to lubricate the bushes where the roll bar passes through them. I used spray white grease, silicone grease might be better but I only had the white stuff to hand at the time. You need to remove the bush to lube the internal bearing surface rather than just spraying the stuff at the roll bar/bush area. Hope this solves your problem.