Keir Starmer must impose a full ban on cryptocurrency being used for political donations or risk losing control of a key new piece of legislation, senior Labour backbenchers warn.
Former minister Liam Byrne, who chairs the business and trade select committee, and six colleagues, including Emily Thornberry, chair of the foreign affairs committee, and Matt Western, who heads the joint committee on national security strategy, have signed an open letter to the prime minister setting out a number of concerns that emerged in committee evidence sessions.