Thank you, POGS, for the info.
I was born in Birkenhead and my mother lived there until a few years ago. My mother is more right wing than even the most right wing in the Conservative Party, but even she would grudgingly admit that Frank Field is a good constituency MP. He sorted out an issue she had with disability benefit. She was in the right, but he took up the claim and fast-tracked it for her.
I know that various people don't think that Frank is a true socialist. They could be right. He doesn't follow party lines. I don't always agree with what he says, but the thing is that people know what they get with him. If the Birkenhead constituency party is thinking of deselecting him, they might as well buy themselves some guns and shoot themselves in the foot.