What is the feedback for job placement for non EU non UK candidates in UK in view of discontinued post work VISA.

For what school? The better ones (LBS, Warwick, Oxford, Cambridge) are going to have better placements than others.

You basically have to have a job lined up by graduation - so the strength of the school's career services and your ability to network will be the main determinants. Hands-on project components tend to be a really good way for MBA students to build relationships with potential employers - and these sometimes lead to jobs post-graduation.

Either way, it's an uphill battle for non UK/EU nationals.