British rules differ from American rules. I'll do American rules first, as they're easier... "If you would" is perfectly okay.
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Anonymousthere isn't really any noticable difference. You wouldn't use should in that statement.You do realize, don't you, that you are answering a question that was asked almost six years ago, and that the person who asked the question is not likely to still be waiting for the answer? That's enough time to finish a university degree!