If you are planning to be in London during the Olympic and Paralympic Games, and you use the train from Deptford, it is probably worth checking out the newly-published timetables for the 'special service' that Southeastern trains has in store for you.
Deptford is losing two-thirds of its train services during this period, according to 853 blog which has more information about travel in the area. Pissed off by this? Spare a thought for those who normally use Woolwich Dockyard (closed for the duration), or Maze Hill, which will lose all services to Kent in the morning and all those into town in the afternoon or evening.
I recommend you take a look now to give you time to go out and buy or borrow a bike before train chaos hits.