If the PLP were in a gambling mood, they could all choose to resign from the labour party and sit as independent labour MPs. This would not automatically trigger by-elections, but would cause the official Labour party to lose its status as the official opposition.
The PLP could choose to form a new party, approach other parties (i.e. the SNP) to form an opposition coalition, or, if they really wanted to shake things up, they could all apply to join the Greens.
If the PLP were in a gambling mood, they could all choose to resign from the labour party and sit as independent labour MPs. This would not automatically trigger by-elections, but would cause the official Labour party to lose its status as the official opposition.
The PLP could choose to form a new party, approach other parties (i.e. the SNP) to form an opposition coalition, or, if they really wanted to shake things up, they could all apply to join the Greens.