central London to Padworth

Does anyone know the easiest way on public tansport to get from Great Dover Street in London to Aldermaston marina, address Padworth, Reading, Berkshire. RG7 4JS
National Express is drawing a blank, trains are a no go....what else can I try?

TIA

Why are trains no-go?
My first thought would have been:
Tube from Borough (or Elephant) to Paddington
Train from Paddington to Aldermaston, with one change at Reading.
(300 m walk to marina acording to this.

But if trains are definitely out, then:
Bus/tube to Victoria
Coach from Victoria to Reading (Megabus, National Express, poss. Greenlines?)
From Reading, Bus No.1towards Newbury.
(if you click to show "all stops" Aldermaston Wharf is on the list)

http://www.tfl.gov.uk for planning your journeys round London, Travel Line for bus info around south-east England.

Or possibly taking the tube out to Heathrow and then take the bus from there. Pop it in google maps as it looks like there are a few options for buses between those two destinations. I don't know the price of those short distance bus routes but they are generally pretty inexpensive.

Thanks - each train route I put in came up as a "no service between these points". Helps to know which stations are biggies!
Train it will be if they will reply to my request to book more than nine seats.