Attributing all this to intelligence sharing alone seems an oversimplification. I suspect the difference in the level of assimilation between British Muslims and their French counterparts is the biggest factor.
The problem with French intelligence is the number of services : − la Direction générale de la sécurité intérieure (DGSI) − la Direction générale de la sécurité extérieure (DGSE) − le Service central du renseignement territorial (SCRT) − la Sous-direction de l’anticipation opérationnelle de la gendarmerie nationale (SDAO) − la Direction du renseignement militaire (DRM) − la Direction de la protection et de la sécurit…
You're saying like this is part of the solution, but it's part of the problem
Though it seems that some of those still might make sense as a separate entity, like Tracfin and DNRED