How long it took for different PMs to reach negative net approval:
Burnham: 10+ days (so far)
Starmer: 31 days
Sunak: 0 days
Truss: 0 days
Johnson: 0 days
May: 321 days
Cameron: 219 days
Brown: 120 days
Blair: 1,155 days
Major: 658 days
Thatcher: 119 days
