The Thames estuary airport will be attached to Kent. Anyone travelling from the north or west to our nations hub airport , Which is pretty much everyone...
will at some stage have to cross the Thames. Now you could take the maglev or use the star trek transporter which will be available ten years earlier ..
Other wise you need the A 130 to become a motorway n cross the river at canvey or pitsea. The a13 and a127 will both need two more lanes each way and the M11 will need a five lane spur via Chelmsford into the estuary.
Numerous tunnels under the Thames ,, oh what's the point. Heathrow runway 3 and 4. Just get on with it