Answering these questions would probably give away more of the book than you want to, I just wanted to give you some things to consider.
A couple of comments
First: Don't forget the flamethrowers - china is one of the few nations to still issue them to troops(i did not think it made sense for Olympic security either but oh well)
Second: Why go to UK? the #1 built in target and release point for political tensions in China is JAPAN. They are still playing sitcoms and TV movies daily on all the bad things the Japanese did in China. It has really created a victim mentality for the people which gets in the way of everything. I could probably start an anti Japanese riot by myself they are so primed for it and I’m a foreigner.
After going back and rereading some of your other answers if the UK started the boycott, then the Chinese people would feel fully justified in taking over the UK to pay them back, plus the propaganda value in the revenge for the loss of face during the opium wars and burning of the summer palace by British troops would be unbelievable. Just depends on how you tie it all together. (Japan would still be blamed even if the UK started it)
Third: How are you going to finish the story? The Chinese leaders cannot lose abroad as they are more afraid of their own people than Nuclear exchange with anyone. They really could care less how many casualties they take as long as they are perceived by their people as having won. Don’t forget the leadership in China were children during the Cultural Revolution and saw what happened to their parents when they lost power, had older brothers/sisters and parents tortured or suicided. (Ding Xiaoping’s son own son was pushed out a window, no wonder he killed the protesters in 1989) They will not go through that willingly.
You might want to use a variation of what Clancy did in “The Bear and the Dragon” but with the great China firewall in place I don’t know if that would work today or in ten years.
You have some real challenges ahead for you to write this story good luck.