You are confusing your zones
No, I'm not. Look at the chart - the data is there. The London CTR is the innermost zone for Heathrow - there is no separate ATZ; the London CTR is Heathrow's ATZ, and access to it is controlled by Heathrow ATC.
If you're going to make sweeping statements, you should provide evidence. You have not done so - nor can you, since you are (incorrectly) arguing simple factual data that is published on the charts.
Vic.