Here's one thing that changed:
Which is a step in the right direction from the Brexiteer perspective. They want to be able to gain a competitive edge by lowering those standards after all.While the references to a "level playing field" were removed from the legally binding withdrawal agreement, the revised political declaration says that the UK and the EU should "uphold the common high standards […] in the areas of state aid, competition, social and employment standards, environment, climate change, and relevant tax matters".