EU Withdrawal

My Lords, I am doing my best to follow the noble Lord’s argument. I do not entirely understand what a widening customs partnership is. It is an unclear concept. We all agree that in a digital age and where standards and regulations are at least as important as tariffs, we are in a different world. When Margaret Thatcher was Prime Minister 30 years ago, she accepted that having a single market was more important than being in a customs union. Can the noble Lord explain how a widening customs partnership would deal with the harmonisation of standards and regulations, which—I think he is arguing—are more important than customs these days?