[rant mode on]
In most cases the CAA does a reasonable job, IMHO.
However, this is an area where the CAA is letting the side down. The lack of approved silencer kits in the UK is having an adverse impact on pilots and public alike.
I honestly think that noise is at the root of a large number of threats to GA: Airfield closures? Noise! Complaints? Noise! Malicious accusations of low flying? Noise!
Seeing as 99% of the UK light aircraft fleet are fitted either with a Continental or a Lycoming, then isn't it time we got the various silencer kits that are freely available in the US and in Germany approved for use in the UK?
Shouldn't the CAA be addressing this by policy?
[/rant mode off]