Although I am not affected by this massive chaos as I am safely tucked away at the other end of the world. Many of my friends and colleagues are!
I passed through Heathrow every month or even more than once since and I have never found it effecient but his current sage is beyond words!
To be honest can any operator (past and present) change this situation easily? I have my serious doubt? You would need to have UK government getting involved and overseeing the current or future operator to make reforms FAST!
But I do hope there will be drastic changes and improvements from now on as it will be good for all travellers no matter where they come from, or anywhere they intend to go to in the future.