So everyone in Southend can get to the Olympics in 35 mins...
That's nice, but I can't see why anyone else would want to go to Southend just to get to the Olympics
1 - Every other town/city/hamlet in the UK can get to London without having to go to Southend.
2 - Everyone from the rest of the world can get to the Olympics without having to go via Southend.
and
3 - Can anyone in Southend afford the train fare AND the average £50 ticket price for the top events...?