I hope that you are right. It would be nice to think that there are some decent double figure barbel about. For the first five years over here I have concentrated on finding the bigger barbel. I can guarantee fish up to 6lb then it gets harder. I travel quite a lot in my job and have spent hours walking the banks of the Vienne and Charente rivers, baiting swims up, and whilst I've seen plenty of large carp I have never seen a barbel over around 8 lb. The Charente downstream of Angouleme is probably the most verdant river you could wish for. Superb water quality and plenty of limestone that promotes weed growth and in turn insect life. The chub, perch, pike and carp thrive, but the barbel seem to hit an 8lb ceiling. The water quality of the Vienne isn't as good, but there are carp to over 40lb in some stretches, and again I have only caught barbel to just over 8lb, and never seen anything bigger in the baited swims.
I have basically decided to stop fighting against the current and go with the flow this year. Hence me coming on here. River carp are the new barbel for me.
I am going down to the Dordogne river area next week for a few days. We go down there a couple of times a year in the camper van so I'll make some enquiries locally. I would have thought that if there were 20lb barbel in French rivers somebody would have posted a photo or a video online by now.