The UK has a regulator and rules about commercial advertising, but last I checked neither apply to political advertising. In normal elections there's often a row about some advert or other (eg the Tony Blair demon eyes poster) but nothing much comes of it.
In this case there is a widespread view that the referendum was decided by misinformed voters and activists are trying to intervene on that basis to halt Brexit.
In this case there is a widespread view that the referendum was decided by misinformed voters and activists are trying to intervene on that basis to halt Brexit.