The Clubs provide techincal advice on the web site, do you mean that the warden should tell people they (think) the outfit is incorrect/unsafe ??? Dodgy ground I feel.
Accidents never happen! look into any so called accident, and eventually you will find someone who has not done what they should have done.Its your responsibility to check your caravan and your car are fit to tow, not any other third person.
As Gumbo states there is enough information on the webs sites for all to see.
If more is required the CC and C&CC do towing courses all over the country that cover all issue's on towing.
In any walk of life you will always find someone that disregards the rules, hopefully they will be caught before accidents occur.
NigelH