I was being a bit cynical, by suggesting that there might be a temptation for the associations to test where the CAA would not. In order to dispel any doubts, it would seem appropriate to publish an up-to-date list of approved combinations. I know the LAA's list is not complete.

What a mess it will be to keep tabs on all those exhaust systems, intake silencers and different prop pitches.

I think it was a mistake for the LAA to volunteer to take on this job. They are just playing into the CAA's hands. It would have been better to simply lobby against the charge on environmental grounds and let the CAA allocate scarce resources to a job that will become less necessary as microlight owners seek quieter aircraft. If the associations take on responsibility, noise testing is here to stay.