Lastly, what about tearing up the Cranford Agreement (not that exists on paper)
Is that a question or a statement ? The Cranford Agreement was declared dead a couple of years ago. The reasons that Heathrow still operates as if it was in place is simply that the required 09L runway holds and 09R RETs to support sustained easterly alternation haven't yet been put in place.
Without alternation and the night flight ban there is substantial capacity to unlock.
How does the presence or absence of alternation affect capacity ?