I agree that since insurers do not actually 'gamble' with money, they don't need the same stringent solvency requirements as banks, but you cant have multiple sets of regulations from differing institutions, the problem was the content of those regulations, not the regulations themselves.
And many countries opted for harder solvency requirements for everyone, including insurers after the crash, call it overcompensating if you will.
I say trivial, because in the budget it does not amount to much money.I would hardly call it trivial, if it was trivial then there would no need for it, or every nation could be net contributors. You could call it value for money, but certainly not trivial.
It's also trivial, because the alternative is worse in terms of money anyway - The UK will lose more money by saving those 9.8 billion.
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That's not a bug, it's a feature.
The very point of the EU and the internal market is to have one rulebook.