Masters query-literature MSc

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I applied to do an MSc in english literature at edinburgh but havent made the requirements some of the individual grades on my transcript ie. dissertation, arent good enough, although my overall classification is fine. Is it worth writing to the university to ask them to reconsider, or any ideas about what i should do instead?
Also, is a masters in a literature subject worth doing, if i am not trying to follow an academic route, or is it just delyaing the inevitable?

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