Three more British companies have said they are willing to join a group to buy the Welsh semiconductor manufacturer Newport Wafer Fab if the UK government blocks a takeover by a Chinese-owned company on national security grounds. The technology executive Ron Black said the new companies had come forward after he revealed the existence of a six-member consortium willing to act as a “white knight” if Nexperia’s purchase of the south Wales company fell through. Nexperia is based in the Netherlands but is owned by a Chinese company, Wingtech. That has raised the concerns of British politicians, who fear that…