Yes, there was proven Russian involvement which could have been decisive, given the close margin. This is not a conspiracy theory. However, there seems to be s

Yes, there was proven Russian involvement which could have been decisive, given the close margin. This is not a conspiracy theory. However, there seems to be some agreement, driven by May and her party, that a second referendum would be even more disastrous to democracy, since in any case the outcome would be close and keep the UK divided (as polls indicate) and at the same time a second referendum would cause people to question the legitimacy of the whole process. Foreign involvement in elections or referenda is a tricky thing, as it happens everywhere in one form or another and the legality of it is often in a grey zone rather than it being clearly illegal.