Can someone apply for a msc computer science after completing....?

Well i did advanced diploma in information systems and now im planning to apply for a msc computer science or any equivalent msc in computing. do i have a chance that they will get me? or should i apply for a bsc? well help me out . i have an imis higher diploma in information systems... any help .
Answer
Some universities will consider an application by someone without a b.sc. if they have had a career track record that shows that they are competent and outstanding in their field. there are a number of uk universities that appear to recognise the imis higher diploma: demonfort; heriot watt university, university of greenwich, etc., but only for entry into their final year b.sc. courses.