Should Labour, in the final analysis, be seen to have in effect collaborated or at least stood by motionless as the Tories go hell for leather for a Hard Brexit, then its perceived waving through of Article 50 will be interpreted as a colossal act of cynicism, which many of the 48%, and indeed many loyal Labour voters, may not be able to forgive.
Labour will also seek to ensure the Government publish a proper plan - ideally a White Paper - before Article 50 is triggered. The House of Commons has already voted overwhelmingly for a Labour Opposition Motion that called for the Government to publish a Brexit plan, and the Prime Minister should be in no doubt that we do not consider a 45-minute speech to be any substitute.
Ultimately, though, we will only see the cultural shift we need on victim's rights when they are enshrined in a Victim's Law. This would be a powerful break with the current piecemeal approach and help tackle one of the most fundamental problems in our criminal justice system: a lack of faith among victims that they will be supported, listened to and treated fairly.
Parliament has the opportunity to re-balance our law in this difficult and sensitive area. Unless we revert to a position of a blanket prohibition of any assistance even for those with a voluntary, clear, settled and informed decision to end their lives, we have to recognise and accept their desire for professional help from medical practitioners rather than amateur help from loved ones.
We believe that things have got to change if we are to restore the public's faith. And that's why Ed Miliband and I have set up the Victims' Taskforce with the precise remit to come forward with a Victims' Law and other recommendations of what needs to change in our justice system. And the Taskforce is already hard at work.