As a genuine question why don't lorries swap the cab bits at the tunnel? Actually, it would seem safer and more cost effective to uncouple the load at Folkestone, stick it on the train with some kind of utility rig (to be invented) then detrain in Calais onto a right hand drive cab with a "foreign" driver. British drivers could pick up incoming foreign loads at Folkestone. The maths should work with British drivers taking more loads shorter distances.
Safer for all motorists with everybody driving in their own country on the correct side of the road. Also, when the French kick off again, everyone is in their home country for the strike season.
Yep, great idea, Would it work? No.
The eastern european guys can run for much reduced rates due, primarily, to the cheap diesel and very low rates of pay for the drivers. It has been a while since I ran international haulage, but I used to be able to get a artic load of machinery back to Warsaw for less than a load to Aberdeen on a UK truck. The Polish guys made the money coming into the UK and would run back for little more than diesel money. Granted, that could well have changed, Ruth would probably know better, being more up to date than I am.
What you suggest certainly used to be the case for loads I shipped to Turkey or Ukraine, for example. No western companies would run into those countries, they met a national truck at the border and waited for the trailer to come back out. Many a country we had to build the price of a trailer into the cost, we just never saw them again.
But anyway, I digress. The general standard of driving is appalling at the moment, be that cars,wagons,coaches or bikes. Braking distances are a complete mystery to a lot of drivers. Well it must because they drive so bloody close to each other. People sat with cruise control applied during busy times, general lack of anticipation, consideration and concentration all amount to the lunacy that is seen on the roads at the moment.
My biggest gripe is spacktards blindly following bleedin sat navs,muppets.