You don't understand me. Technically we don't allow lobbying here.
If we allow politicians to be held to account for their hustings claims like this then we allow lobbying via the court system. Rich people and lobbyists will raise money and sue whichever politician they disagree with for whatever reason they can imagine.
'Lets get the rich bastards' is lazy thinking, shortsighted and ignores the clear dangerous precedent being set.
To be fair and hold all the rich politicians to account for their lies during Brexit, or any other campaign, will just put all of them in the dock. Mainly because anytine anyone uses a statistic to prove something, someone else can disprove it and call them a liar.
The side of that bus had a statement that was based in a truth... he wasn't lying about the initial size of the EU payment the UK is liable for. So it is unlikely that he will be prosecuted.. as many other politicians used similar tactics, and always have!