I looked underneath yesterday after the LHS silencer had been adjusted away from rattling on the underneath and the bracket bolts are rusting already so this and nearness to ground level is no doubt the cause - need to get KH to get some stainless bolts.
The issue with the Aero 8 is not one of corrosion, mine has never yet been out in (to quote Mr Clarkson)... even "mildly moist" road conditions ... the brackets are effectively shearing with the vibration/torque twisting effect of that engine....
I thought perhaps that the cobbled streets of Edinburgh may be a contributory factor but I don't take it into town that much, although having said even the surfaced roads in town are reminiscent of a shell scarred battlefield!