From Arden House on Thursdays, Fridays or Saturdays travel by Hythe Ferry.
Otherwise, and on other days, try using the bus. The Star 9 takes just half an hour and runs from outside our front door to West Quay, just a ten minute walk from Oxford Street. There are buses back at 9:30 and 11:10 every day, even Sunday - and on weekdays there's one at 10:30 too.