"Together, we must take back control of our borders," National Rally president Jordan Bardella told a packed-out main hall at Reform UK's annual conference in Birmingham last week.It was a message tailor-made for the turquoise-lit room of migration-sceptic Reform UK supporters, echoing the language that won the 2016 Brexit referendum.But the fresh-faced 30-year-old Frenchman had not crossed the Channel just to recycle decade-old slogans and sign…