Nothing changes here IELTS-wise. Diplomatic Immunity reigns and many examiners have visas which don't permit work. They shovel out money to examiners for large exam sessions - some examiners can command over GBP 3000 a month - no tax, no commitments. Others not only test, but are also EOR personnel and Trainers. For them IELTS is a full-time job but, of course, they have no security. However, they seem to like it. A bunch of naive, lazy losers (I sound like Colonel Blimp).
On another tack, I feel that the BC does bugger all that could be considered effective to promote British Education in China. You might think that a key role for the BC would be to provide help and advice to parents and students, who seek an International Education in Britain, in a transition process from the Chinese education system to that of Britain. Their efforts are desultory and derisory. The reason why is because they can't see a profit in this direction. Parents and kids don't understand the transition and therefore can't see the need to reduce the risk in their investment in education overseas. This is what you might expect the BC to be cognisant of and be active in - a direction that would ensure success stories from a British education.
It seems to me that the BC is immoral. There seems to be no central guiding ethic related to purpose or "mission" apart from making bucks. I was critical of the org 35 years ago - still am. What a wasted reputation it has in mere survival. Lost dignity, and a blight on the UK's copybook.
The UK with its history and reputation for welcoming overseas students - whatever their ability - is being ruined by government, and the mere survival instinct of the slug that the BC is.