I suppose going into a GE on the back of delivering Brexit by both main political parties would be considered a lie and liable for prosecution, as neither of them clearly had any intention of doing so. Signing up for article 50 by 80% of the H of C, again with no intention of delivering Brexit, in fact for many, quite the opposite,could be considered deception! As for the bus, it stated quite clearly that it was a) a query not a fact, and b) a suggestion for AFTER we leave the EU! As we haven't left the EU, you cannot know whether this will happen or not, so how can you judge the intention?! You can't sue before the event! Mind you in these days of lying duplicitous MP's, el al you probably can!!
As for voting? Who for? who can you believe? Perhaps if politicians could, just even try not to constantly lead the voting population up and down the garden path, they might find that people were more enthused about voting! Politicians have to encourage people to vote, not force them.