From Here
A freedom of information response last month revealed the Electoral Commission found “no reasonable grounds to suspect that any breaches” of the spending rules had occurred.
The watchdog has defended its decision in an email to InFacts, citing the EU Referendum Act, arguing a “common plan or arrangement” between Vote Leave and BeLeave had to be in place for joint spending rules to apply, and that it was fine for separate campaign groups to “liaise and discuss campaigning approaches”. What’s more, Vote Leave’s payment directly to AggregateIQ on behalf of BeLeave was also “acceptable under the law”.
The Good Law Project say this misses the point. The main issue is not whether the two groups had a “common plan”, and therefore whether the donations count as joint spending and should have been registered by Vote Leave (although it seems clear they were working together). Rather the Good Law Project argues that these payments are not donations at all, but straightforward referendum spending by Vote Leave. To deny this is to undermine the purpose of the law, which is in place to stop wealthy campaigners spending potentially unlimited sums of money by, for example, buying services for others who are known to be campaigning for the same result.
The Electoral Commission told InFacts it had no further comment to make on this point.
The Good Law Project is also demanding answers from the Electoral Commission. In particular, have there been other investigations into similar arrangements with other groups? Vote Leave are known to have also given £100,000 to Veterans For Britain for AggregateIQ’s services.
If the case is successful, the Electoral Commission’s decision to accept the Leave campaign’s spending will be quashed. It will then have to reopen its investigation into Vote Leave and maybe prosecute it. Ultimately the validity of the referendum could be brought into question.
Pro-Europeans in Parliament and across civil society must make a noise about this, and demand those responsible brought to account. Otherwise Britain might have been dragged out of Europe on the basis of a potentially illegal campaign.
You can make a contribution to the Good Law Project’s work on this case via their Crowd Justice page.

Even if the payment was illegal (and the Electoral Commission say it wasn't) it is dwarfed by the Nine Million Pounds spent by the government issuing Remain propaganda to every household in Britain.