The trouble with both those amendments is that both of them are about the UK parliament deciding something should happen which are completely out of its power to make happen, and which there is no reason can happen.

The Brady one is just about expecting the EU to do something it has repeatedly said it will not and cannot do; and the Cooper amendment isn't much better. Even if the Prime Minister can be compelled ask the EU to postpone the March headline when the UK is due to cease to be a member of the EU - there is no reason why the EU should agree to that, given the continued refusal of the UK government to change its "red lines".