China's Secret Service men on streets of London - why?

Multiculturalism showing it's real face. A Black female athlete surrounded by the guardians of the most vile regime on earth, in the capital of freedom. For those who decry the growth of the BNP, this picture should be explained in words not spouted by an apologist politician.
If this is the nation you want, you can have it. But it is not the nation I fought for with the freedoms I espouse.
Spin as fast and as well as you can, this picture tells you everything that is wrong with our society. If you cannot see it, then you will never see the truth until it flies into the Palace of Westminster on board a hijacked British Airways Airbus, filled with our kith and kin bound for Canada.
One simple question. Who gave the Chinese the right to prevent lawful British peoples carrying out their lawful, democratic RIGHT TO PROTEST on BRITAIN'S street?