Re: MBA in UK
MBA is not considered as normal academic degree and students are mostly expected to get sponsorships from their employer. However still there are some kind of part scholarships are available but for high ranking Universities its not easy to secure one.
You will be needing to visit one of the University & discuss the scholarship possibilities with your course tutor.
For MBA you do not require to go through UCAS, UCAS is only for undergrands, some Universities have started using it for Post grads but its not called UCAS its some other service. Nevertheless MBA is not through that system, since its not normal degree.
Bear in mind that MBA fees are usually much higher than normal Post Grad in UK. For a high ranking University expect to pay between 22000 to 32000 GBP for 18 months long course.