0ur deputy political editor, john pienaar, reports on what's likely to be a very challenging process for theresa may's government. his report contains flash photography. brexit‘s still a work in progress. it's about westminster taking back control, but the planning and scheming is now intense and, tonight, it's clear big questions of how — even when — britain finally leaves are up for grabs. reporter: do you think this is a meaningless vote? brexiteers like liam fox and borisjohnson are now told the brexit deadline of march 2019 will be met by law, but the brexit secretary would love to know if the way is clear to leave on schedule. and tonight, there's still no knowing. european withdrawal bill. in the commons, they've started weeks of line—by—line debate on the law to leave. tory and labour mps saying a hard brexit deadline could cut negotiations short, even force britain to leave without a deal. everybody‘s got more and more brittle. more and more unwilling to listen. more and more...