The front brake calipers are prone to sticking which leaves the brake pad dragging on the discs. This causes a vibration through the steering wheel under braking because pad material is being left unevenly on the brake disc surface (not the urban myth that the brake discs have warped).
Tell tall signs that your Insignia is experiencing these problems is that the brake discs can turn blue due to the massive heat created from the pads rubbing on the discs.
This is in addition to the pads and discs having a much shorter life than would be expected.
Vauxhall in the UK are replacing the brake discs and brake pads free of charge on cars with less than 20,000miles on the clock.
Given the treatment that Peter Tomalin had from his Vauxhall dealer I find it extremely hard to believe that Vauxhall in the UK identified this problem. My feeling is that the technical bulletin came from Germany which would mean Opel Insignia OPCs would also be experiencing the same issues
Problems have also been reported with the headlights blinding other drivers because they are set too high. Your local Vauxhall dealer may tell you it will pass the MOT as it is, which is true, and they may also tell you that it is impossible to adjust which is NOT true. The height of the headlights CAN be adjusted, don’t take no for an answer if you have this problem, if your dealer will not help you take it to Vauxhall head office.