I agree with you but that doesn't invalidate the initial vote. The only marginally democratically legitimate way to do a revote would be for the UK to ask to vo

I agree with you but that doesn't invalidate the initial vote. The only marginally democratically legitimate way to do a revote would be for the UK to ask to voters to choose between actually negotiated and realistic terms (or maybe multiple, e.g. hard brexit + any deal they can strike with the EU if ever) and staying.