Help with travel: London 2012 Journey Planner

I thought I'd planned my journey and this seems to have massively overcomplicated it - so just a warning that what it suggests may not be the best way...
 
Well I put my journey details into this planner and the only option it gave me for getting to Greenwich on 7th August was to travel up the night before arriving about 11.30pm! And then it gave me no options at all for the return journey!! Interesting!!!
 
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