Seven candidates are hoping to become Andy Burnham's successor The by-election was triggered after Mr Burnham was elected as Labour MP for Makerfield, meaning he had to stand down. Key points and original sources are listed below.

• Seven candidates are hoping to become Andy Burnham's successorS1

• The by-election was triggered after Mr Burnham was elected as Labour MP for Makerfield, meaning he had to stand down.S2