totally understand.
if you use:
http://journeyplanner.tfl.gov.uk/use...T2?language=en
and scroll down to
only tick the type of transport you'd be ok with (bus and rail) then it will give you a couple of alternatives of how to get from Fenchurch rail station to soho.
I just pluged it in - take the 25 to oxford/soho. take you about 30 min. if you plug that in yourself, it will give you the map of where to get it and the route map.