Here is where to find the answer: http://www.ipo.gov.uk/tm/t-decisionmaking/t-law.htm

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Thank you. Yeah, I found the link when I was searching before, and now had a serious go at wading through the manuals. And I'm convinced how complicated it is. There were many helpful examples, but I couldn't find any that bore directly on this, even if just to say hadn't come up in court. (I infer you mean, "if the answer is anywhere, the answer is there, so looking is better than talking about it on livejournal", rather than "you're pretty sure the answer is there". If the latter, I'll read more exhaustively, unless you have any more precise directions.)

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