Hi Pallykin!
The place it is sent to depends on what type of visa you are applying for. Settlement visas (spouse, fiancé, etc) must be sent to Sheffield for processing, while non-settlement visas (visit, education, marriage-as in just going to get married then return to the US immediately afterwards, etc) are sent to the British consulate in NY for processing.
And unfortunately the "decision made" email doesn't tell you what the decision is... Although I'm sure we all wish it would! Lol you just heb to wait for it to get back to you to find out. But I've read that some people will email them back and request and answer and they actually get one, but I don't know if that really happens or how often...
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