David Beckham told a news conference in China: "I'm very proud to be an ambassador and help the game here from the very young ages up to the professional level.
"I'm very proud and thankful for this opportunity and I look forward to being part of this project."
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They met the stars of the new Star Wars movie at the Royal Albert Hall in London, arriving on the red carpet to be greeted by robot BB-8.
The station, which saw 44m people commuters use it in 2016/2017, will be transformed into a dining room complete with Christmas decorations.
Part of the monster fatberg will go on display in the Museum of London, while the rest of it will be converted into biodiesel.