BSc Unacceptable for MA Playwrighting

I discussed entry to the University of Glasgow MA in Playwrighting and Dramaturgy with three different course leaders over a number of years (it took me a while to save the money for the course). All of them seemed to welcome my application. While my undergraduate degree is in a science I have considerable theatre experience, work with a classical theatre company, have directed and acted on the London stage and have had a play produced three times. When I formally applied to the course I was immediately rejected for having the ‘wrong’ type of undergraduate degree. The entry requirements however did not specify a BA. Is this good sense, that a science undergraduate degree would leave me hopeless and helpless to deal with the course, or is it some kind of prejudice? It seems my other accomplishments were not taken into account, and the rejection had an automated feel about it.

I discussed entry to the University of Glasgow MA in Playwrighting and Dramaturgy with three different course leaders over a number of years (it took me a while to save the money for the course). All of them seemed to welcome my application. While my undergraduate degree is in a science I have considerable theatre experience, work with a classical theatre company, have directed and acted on the London stage and have had a play produced three times. When I formally applied to the course I was immediately rejected for having the ‘wrong’ type of undergraduate degree. The entry requirements however did not specify a BA. Is this good sense, that a science undergraduate degree would leave me hopeless and helpless to deal with the course, or is it some kind of prejudice? It seems my other accomplishments were not taken into account, and the rejection had an automated feel about it.

What evidence do you have of the course leaders encouraging you, particularly the current one?

A one hour informal interview.

A one hour informal interview in which she said she would be happy to have me in the course. When I was rejected she was surprised and directed me to apply to the MA in Performace which does not have the undergraduate subject restriction.

If the course leader was surprised that you were rejected, then clearly she wasn't the person doing the rejecting. So it's more likely that (a) someone in the admissions office rejected it due to the "in a relevant subject" issue, and that (b) the course leader doesn't know the criteria the admissions office are using to rejected candidates.
The fact that she's suggested that you apply for a different course instead implies that she has no interest is trying to "work around" the general postgraduate admission criteria, which is a little disappointing given that she said said she "would be happy to have me in the course".