Surprised no-one has mentioned Woodbridge. The railway practically forms the boundary to the Marina, the station is but 5 minutes walk and importantly there are supermarkets ( Ok only one !) in the town within 10 minutes walk. I think you have to change trains at Ipswich ( 1 hour from Liverpool Street), but then it's only 10 minutes or so on the local train to Woodbridge. Lovely spot as well.
