Trailer accident stats were not collated for a long time after the 97 change.
Plus its only been over the last 5 ish years that enforcement & education on BE has been promoted. What I can say is that the 2018 trailer safety study showed that driver error & lack of training was the biggest cause of trailer accidents. They were actually looking at starting the MOT for trailers but the stats did not support that change. What it did support was making the tests harder & doing more education & promotion of training & the need for the BE test. DVSA own recommendation was to increase testing & training for BE. The DVSA are refusing to show the H&S justification in their decision that it will have minimal impact on road safety.
It is interesting that when you see a caravan splattered over the road it does tend to be a pre 97 licence holder. Most I see locally that are speeding are again pre 97 licence holders, Same again re being in outside lane on Mway.
Over the years I have trained people that are shit scared of towing to those that have been towing illegally since 01-01-97 & think they know it all. All of them learnt something on the course,. No I dont know it all but I do know how to get the best out of people & get them to be the best that I can. My role was not just driver trainer but also life coach & phycologist. For most people coping with stress situations is a big factor.
A few things you would not believe clients have told me about their driving:-
I have been driving 5 years & have not been further than 10 miles from my house.
I have never been on a dual carriageway.
There are no roundabouts in the area I live so have never been on one before today.
I only drive to & from work (so in 10 years of driving that have 30 mins of actual experience repeated many times).
I cant park my car unaided.
I never reverse, ever.
I dont drive in towns or cities & the opposite I dont drive in the country.
I sometimes honestly dont know how some actually drive themselves to meet me.
Now dont get me wrong most are not that bad. However virtually all have let bad habits form & need a brush up in their general standard of driving. In fact most of the course is getting them to a basic standard of driving that car drivers should already be at all the time.