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Internally, they probably are.
Some EU countries are happy to route tax via evasion routes (like The Netherlands / Ireland Luxembourgh) which might not work if you set up shop in the EU to process EU banking work there, rather than in the UK.
The city of london/offshore UK tax havens are really something else though.
But the CoL may still contribute more in UK tax income than all the other banking work that is now being moved abroad with profits being generated/taxed there?
I think other EU members are much more attuned to corporate tax avoidance than the UK...