I'm not reading all that lot to try to work out what your point is, other than you're suggesting that it's MPs who are the covert influential organisation.
But collectively they're not covert.
If EFLImpudence's conspiracy theory is correct:
if these' loopholes' were designed flaws, they would have been designed by a covert group of influential MPs, not all of them. And not all of them would be in the 'need-to-know group'. Hence that group would be covert. They would obviously be sufficiently influential to be able to bypass scrutiny by others.
And there's been no explanation for who, when or how these 'design flaws' are introduced.
Therefore EFLImpudence's hypothesis is a conspiracy theory.
If they were loopholes, there is a simple explanation for how they came about, simple oversight, or errors, or expert knowledge of the system by the loophole benefactors, who had no hand in formulating the laws.
Because MPs have exploited the loopholes does not mean that they formulated those loopholes, just that they had access to clever accountants.
And when some loopholes become common knowledge, those same MPs move to close the loopholes.