Suppose the British nuclear program was able to develop its own explosive metal bombs before the end of the war against the Race. Perhaps Britain kept a portion of the Race plutonium for themselves before passing the rest on to the US to give them a head start, or maybe the Americans gave one of their bombs for the British to use. If in the Cairo Peace Treaty, the Race treated the British on the same level as the US, Germany, and the USSR in the canon TL (since they'd all be nuclear-armed), could Britain have retained at least some of its overseas empire? Like India and Burma, for instance?