Christian Wakeford became the first Tory MP for 15 years to defect to Labour.
Other Conservatives had quit the party and “crossed the floor” to UKIP, the Lib Dems and Change UK, but not since June 2007 had one joined Labour.
The 37-year-old was elected MP for Bury South in December 2019 as Boris Johnson led his party to a landslide.
