Hi, I'm unfamiliar with the term "level best" and I don't know what a "casual announcer" is. Your application seems to be written in British English, which I'm also unfamiliar with, so I'm not sure about how to approach this. Thus, I'm only fairly sure that one sentence should be changed: Since the above-mentioned job has always had a fascination on me I would therefore be glad and honored to be given an opportunity to prove my worth in the field.
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