> The Remain campaign completely blew the legally mandated spending limits for campaigning in a single mailshot to every home in Britain
As benj111 points out, it was the _Government_, not the Remain campaign. Different rules apply to them (they are prohibited from campaigning _at all_ during the 28 days prior to the referendum). Furthermore, a large percentage of distribution (to England) was done at a spend time when the spending rules did not apply at all (which to my understanding means the Leave campaign could have _also_ spend more during that time).
> They spent far, far more money than the Leave campaign did.
This is an exaggeration. The cost of the mailshot was £9.3m[1] - the Leave campaign could spend up to £7m (in the regulated time - as above, I believe it is unlimited outside of that), with UKIP a further £4m (and other groups could spend up to £700k). More, yes, as the Remain campaign could _also_ spend up to £7m, but "far, far more" feels like an overstatement.
[1] http://researchbriefings.files.parliament.uk/documents/CBP-7...