the question from opponents is at what cost? helen catt, bbc news, norfolk. london has become the world's largest ultra low emission zone, after the existing scheme was expanded to cover the whole of the capital. all of london's 32 boroughs are now inside the zone, meaning drivers who own vehicles that don't meet emissions standards, will now have to pay £12.50 a day to travel in any part of the city. critics say the financial burden will fall hardest on the poorest households. the foreign secretary, james cleverly, has arrived in bejing, for the first visit of a senior government official in more than five years. he's expected to meet his chinese counterpart and the country's vice president, to discuss issues ranging from climate change to the war in ukraine. stephen mcdonell is in beijing for us. what can we expect from these meetings? relations are anything but smooth at the moment between beijing and western governments, so we expect at