Why should those MP's not feel the pressure over what they've decided to allow?
Well they have received abusive messages death threats and their staff abused and threatened with deselection by s shadowy Corbyn group linked to the momentum which is basically trying to get rid of any labour MP who is not and out and out communist. That's no way to run what was once a respected political party they are just a bunch of thugs. But also even without that why should they be under pressure ? It was a free vote. If any of their constituents have an issue then they contact their MP in a civilised manner.