Largely politicians grandstanding in ignorance.
I have particularly liked the way they go on about how HMRC must be independent, seen to be independent and impartial, then insist that HMRC shouldn\’t keep the tax matters of individuals (personal or corporate) confidential from politicians.
Politicians who would, never, ever, be anything less than entirely impartial when in possession of detailed information about the tax affairs of an individual (whether corporate or personal).
Imagine, as an example, what Chuka Baby would do if he had access to the details of bank taxation. Actually, no need, given the way he lied/dissembled/completely misunderstood for political grandstanding reasons when he was told about Barclay\’s corporate taxation payments.