BeeDeeDubbleU - 10:03 pm on Aug 11, 2011 (gmt 0)
And, BeeDeeDubbleU, if you see a difference, use, as others have suggested, "Thanks for your interest."
It is nothing to do with whether or not I see a difference. It is a fact that there is a difference in UK English. Over here if someone mentions an "inquiry" we immediately think "court" or "hearing". If someone mentions "enquiry" then someone is asking for an answer to a question. But don't take my word for it.