Transport for London (TfL) has called on ministers to invest in the future of Bank station as work begins on the new Walbrook entrance.

A new ticket hall, which is due to open in 2015, is now under construction as part of Bloomberg’s European headquarters. But despite the investment, TfL has said that a major upgrade is needed at the station to handle growing passenger numbers.

TfL said the number of people using Bank each day is now more than twice the number of passengers boarding trains at Clapham Junction.

A major upgrade of the station would include ‘a new Northern line southbound running tunnel to free up platform space, interchange tunnels and an additional station entrance – as well as step-free access to the Northern line’.

In a press release announcing the start of work, TfL said that it was essential that the Chancellor backed the Tube’s investment programme in next week’s Spending Round to ensure vital improvements go ahead.

David Waboso, London Underground’s director of capital programmes, said: “Bank is one of the busiest stations on the network and we’ve been working closely with the City of London Corporation on plans to create more capacity at this important interchange.

“The Walbrook new entrance is the first key step in implementing these plans.”