Government suffers first by-election double defeat since 1991 walesonline.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from walesonline.co.uk Daily Mail and Mail on Sunday newspapers.
Conservatives fear they are facing a mortal threat in traditional Blue Wall heartlands as well as the so-called Red Wall that gave Boris Johnson his huge 2019 majority.