2. Considering we didn't have a referendum to join the EU in the first place, I'm not sure it makes sense to have a threshold. If the threshold wasn't met, I'm not sure how the default can be to be part of something the British people never said they wanted.
3. I absolutely agree that people need to have accurate information to base their decisions upon. So it was a real shame a lot of the information published by the remain campaign was not entirely true. I'm not sure what promise UKIP made you're referring to.
It is true that democracy requires more than simply going with what the majority want. But in this case, there was a clear choice between leaving the EU or remaining. I really don't see how it can be democratic to keep the UK in the EU after the result of the referendum.