Brexiteers battle for Big Ben to bong on January 31th People in London's Parliament Square share their thoughts after Brexit supporters began a crowfunding campaign to pay for London's Big Ben to bong at 23:00 on January 31 when Brexit formally enters into force, a cost estimated at £500,000 because the tower is currently under restoration work. However, a House of Commons commission has stated that the money could not be used because of rules on financial donations.