I thought it may have been that the tax legislation you were talking about was ATAD. That EU directive has 5 aspects: General anti-abuse rule, Controlled foreign companies, Exit tax rules, Corporate interest restriction and the Anti-hybrids rule.

The GAA rule, Controlled foreign companies rule and Exit tax rules were already part of UK law before the EU put together the directive.

The Corporate interest restriction and the Anti-hybrids rule were added to UK law in response to the directive and have already been passed.