Daniel Poulter has defected to Labour in a dramatic blow to Rishi Sunak, with the former Tory minister backing Sir Keir Starmer’s party as a “serious part of government” in which Britain “can trust”.

In his shock defection, the NHS doctor and longtime Tory claimed “Labour alone has the will and the trust to restore and reform” the health service and warned the Conservatives had become a “nationalist party of the right”.