Contrary to the activity in this forum for UAL (and elsewhere on TSR), there's very few students from LCC and/or UAL that are actively studying. Many are in the process of applying, like yourself. Therefore, you won't find many students that have undergone your particular course, let alone postgraduate.
The competitiveness (difficulty) of gaining acceptance is determined by the individual college (among the six that comprise UAL) and, more importantly, the individual course you are applying for. In this regard, there's too many variables to provide a conclusive answer to your question. I suspect, regarding you meet the requirements for your course, you will have a fair chance of gaining acceptance.