When you mention Uzbekistan doesn't allow dual citizenship. Does that mean we would need to cancel his citizenship using the Embassy before applying? Or can we cancel afterwards ?

Hi All, I am applying for my eldest son to become a British Citizen and obtain his first passport. However i think things are going to get a little complicated reading this thread. He has a current Uzbek passport in which his surname is that of his birth farther. On his ILR card we also kept this sa...