Newspaper headlines: Tory MP defects and Labour 'would keep triple lock'
The defection of Tory MP Dan Poulter to Labour features on a number of Sunday's front pages. In an interview with the Observer, Mr Poulter, who is also a part-time mental health doctor, says the experience of working more than 20 night shifts in A&E over the last year has been "truly life-changing" and that he feels the Conservative government has been "failing on the thing I care about most,