Britain stepped up efforts today to look at the case for a digital pound in response to the challenge posed by cryptocurrencies such as bitcoin, and outlined plans to make its financial market more attractive after Brexit.

"We're launching a new taskforce between the Treasury and the Bank of England to coordinate exploratory work on a potential central bank digital currency (CBDC)," Britain's finance minister Rishi Sunak said.

He made his comments at a financial industry conference today.

"Alongside this we will set up a new financial market infrastructure 'sandbox' for firms innovating with technologies like distributed ledger technologies," he added.

The Bank of England said that it and the UK government had not yet made a decision on whether to introduce a CBDC in the UK, and that it would engage widely with stakeholders on the benefits, risks and practicalities of doing so.

Any digital currency would be designed to exist alongside physical cash and existing bank deposits, rather than to replace them, the central bank said.

The taskforce will monitor developments overseas to ensure the UK remains at the forefront of global innovation on digital currencies, it added.

China is a front-runner to launch a CBDC, which could help authorities modernise financial systems, meet the threat from cryptocurrencies and speed up domestic and international payments.

Last week, the European Central Bank said it was studying an electronic form of cash to complement banknotes and coins but any launch was still several years away.

Since Britain's departure from the European Union's orbit on December 31, the financial sector has faced restrictions on serving EU customers, and the British government is seeking to make London a more attractive global financial centre.

The government will propose removing restrictions inherited from the EU, including on who can trade shares in London and the double volume cap.

This would help Britain attract more "dark" or anonymous trading by big investors after Amsterdam toppled London as Europe's top share trading centre in January.

"The consultation process aims to deliver a rulebook that is fair, outcomes-based and supports competitiveness, whilst ensuring the UK maintains the highest regulatory standards," Sunak said.

Britain will also propose changes to prospectuses, a document companies must publish when listing on an exchange or issuing new shares.

The aim would be to ensure the rules are "not overly burdensome", Sunak said.