In message , Tom
Anderson writes

Based on what the article says about Southend and Sheerness being the
closest towns, i'd guess that the islands would be built on either side
of the Medway channel, at about 45-50 minutes east of the meridian.

Unless there are rival proposals, I think you may be far too far east.
See:

http://www.teaco.co.uk/siteplan.pdf
--
Paul Terry