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//I read that by comparison this alleged overspend pails into insignificance compared to how much remain actually spent. //
Where did you read it?
I do think the Remain camp had their own unfair (if not illegal) advantage, in that the government of the day sat openly on their side. Albeit in theory as private citizens, I don't think anybody seriously believes that they simply put aside the influence and contacts available to them as the government for the duration of the referendum.
In addition, despite being a Remainer, as I've said before, I'm not convinced that foiling Brexit will do anything other than expose the UK to other forms of harm.
But I am a little surprised to see people trying to shrug off or dismiss illegal overspending. Campaign finance laws (such as the UK has them...) are there for a reason and setting a precedent for just ignoring them has very serious consequences down the line.