Project leader Tony Sefton says transport links make the site in Kent an ideal location to develop a theme park but a lot of work needs to be done before building begins.
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Prince Harry is in Toronto, the host city of the Invictus Games, ahead of Saturday night's opening ceremony.
The Prime Minister said she expected an implementation period of "around two years" as she called for a "creative" approach to talks.
The first signs of autumn are appearing as the equinox marks the start of the season.