he Brexiters said they would divert the £350M into the NHS and the Brexiters voted for it.
I dont think tha they did. They never had the power or authority to decide what to do with any money.
What they did say, was that that amount would become available to spend on the NHS instead of going to the EU coffers.
Even so, the electorate should decide which argument they prefere and vote accordingly - as with any election or vote.
If I say I am going to give all DIYnot members a new drill if they vote for me as the most jolly member of the forum, then everyone's first question should be "Well, how are you going to do that?".