Engineering works on Saturday, meaning there’s no trains from Charing Cross or London Bridge direct to Charlton, normally a 20 minute trekI’d suggest getting the Northern Line from Euston to London Bridge and then get the Jubilee line from London Bridge to North Greenwich ( The Dome/02) and then jump in a cab for a couple of minute’s ride to the ground. It’s hardly a polar expedition. Should take less than 20 mins to get to North Greenwich from Euston