A few choices, none that are much fun... as already mentioned, train to L Bridge then Jubilee line (average 55 mins door to door for me from East Dulwich) - it's hell but you get used to it (eventually...) Boat is lovely but extra cost on top of travelcard. Train from Peckham Rye (or Nunhead) to Lewisham and the DLR up is great as you're kinda going in the "wrong" direction, train nearly empty, get on DLR at first stop (takes about 40 mins station to work). Annoyingly though in the morning there is only the 8.35am from Peckham Rye which doesn't work for a 9am on the dot start. If you want to throw it out there you can get the 78 bus from Nunhead to Tower Hill and get the DLR in that way. We need a bridge from SE London to the Wharf, to be able to get a bus or to cycle there directly would be great. Even with the East London Line extension (eventually) it will be hell trying to squeeze on an already packed Jubliee line at Canada Water...