UMIST is a good uni in management. If your first degree is from a recognised univericity in China, I don't think you need to provid anything else apart from IELTS at 7, provided that your frist degree is management related area.
UMIST is University of Manchest Institution of Science and Technology. It is about 5 or 6 in the management ranking. I will say it is a much better if you do management course here.
UMIST and U of Manchester combined part of their management shools. So the shool is actually very strong and enjoys the reputation of U of M! Some programmes need GMAT, some not. Should be in the top 5 B-shool of UK.