Peachpudding - I (think I) know what you are saying in that because we have FPP, in mass majority constituencies, it's never likely that your vote will make any difference either way. In marginal seats that's not the case. But BOTH PR and FPP are democratic, and BOTH are based on 'the people's voice' as you call it. FPP in, by some measures, less liable to be influenced by politicians than PR (in PR systems the electorate doesn't get to pick - or sometimes even to know the order in which candidates are placed by their parties, so there's a huge incentive for candidates to brown-nose politically, and not to bother so much with the electorate).
Like others have said, I didn't sign that petition thinking anything much would happen. I signed it to show that I very strongly support Remain, and think it is appalling that there was no threshold vote.
What would people be saying if there had been one vote in it: 17 million on one side, 17 million and one on the other?
And as for Brexit means Brexit, I stick firmly by what I've said. The Brexit promise is that we STOP immigration, STOP paying so much to the EU, STOP being bound by EU regulation, and KEEP access to the single market. THAT WAS THE MANIFESTO, in so much as there was one - so, go implement it! No shirking, and no compromises please! And if you can't, then you need to go back to the country and say -- here's what we CAN get - is that ok?? And if people still say yes, then that's fine. At least we'll know what we're getting, more or less.