Is this a spoiler, perhaps? Get the proposal deliberately turned down, and then say, well damn you, we will put it in the Thames Estuary instead??
Sure. It is, just like FBI+, another spoiler to make a third runway at Heathrow look much more acceptable. Nothing more, nothing less. A complete non-starter. I suspect BAA insiders even wrote the press release - just add in "Chinese sovereign fund" and it all looks credible. Then go and take out a map of the area and you see it is a complete non-starter, just like FBI but with an even more absurd price tag.
+Fantasy Boris Island