The "probably not" was intended to be an answer to the question "would you support" - apologies, that wasn't clear.
My overall point is that details matter for good policy. A regulator having the power to ban a foreign merger for supposed anti-competitive reasons, but really political ones, is not the same thing as, say, a legislative body passing sanctions legislation.
In other words, just because the UK wants to ability to sanction a Chinese business does not mean the Competition and Markets Authority needs to granted the ability to interfere with Chinese mergers.
My overall point is that details matter for good policy. A regulator having the power to ban a foreign merger for supposed anti-competitive reasons, but really political ones, is not the same thing as, say, a legislative body passing sanctions legislation.
In other words, just because the UK wants to ability to sanction a Chinese business does not mean the Competition and Markets Authority needs to granted the ability to interfere with Chinese mergers.