Transport for London is considering phasing out coins and notes next year and replacing them entirely with contactless payments - such as Oyster Cards.
TFL says it would help save millions of pounds. But thousands of people still rely on cash to travel around on London's buses every day, and critics warn it could put jobs and safety at risk.
Rags Martel reports:
More top news
A lamp in the tower which houses Big Ben is to be switched off for the first time in more than 70 years.
Sir Bruce entertained audiences for more than seven decades.
Work in the tower will also pause over the bank holiday weekend.