Apology accepted.
If not the apple cart, then what exactly is stopping the supposedly newly-shy Corbyn from declaring the plan in public? (Assuming you’re right about this secret plan, of course.)
Being scared of what side the electorate will take between an open and plain-speaking Corbyn versus Tories saying Brexit means Brexit in response ain’t a good look. Why not have the confidence to eschew tippy toeing around trying avoid spooking the animals?
It wouldn’t be difficult to say something like The scenario we’ve found ourselves in as a country is clearly nonsense, but we recognise our parliamentry status in terms of us not being the government, so, with the best interests of UK we support the efforts of the Gov in attempting to secure the best future for this country. BUT, when the full details of those efforts are known, should the Gov have failed in achieving this by securing X,Y, and Z, under no circumstances will we give parliamentry support the continuation of the Brexit process and we will do everything possible to halt it when the time comes to approve the deal in parliament.
Or words to that effect. I’m not a speech writer. But you get the gist.