I agree but until such time as they do so, they will have to abide by the rules!
Listing on LSE has nothing to do with Competition Commission.
In this case UK Civil Servants are attempting to interfere in something covered within EU law, EU Law which didn't seem to have a problem with this.
The claim that because companies trade in UK is a basis of Govt interference means that French Govt can interfere in IAG / EI because both EI and IAG trade in France. Once you allow interference it means you allow everybody to do it and make whatever reasons they wish.
Likewise this will set a precedence that any EU country can get involved in any takeover because one or both companys involved trade in that country.
The whole basis of the claim that Ryanair holding a minority shareholding would block any other airline considering a bid has been proven to be false, yet UK Govt will still push that because bureaucrats the world over cannot admit they are wrong.