As part of creating a new corporate style guide for a major worldwide tech company, I am tasked with creating a guide to converting documents from U.S. English (in which this company produces its documents [and in which I write]) to UK English (which is preferred by many of the company's sales regions).

I have found many vocabulary/spelling/punctuation/syntax conversion sites online, but all the ones I've found either do what appears to be a very good job on the UK English (but what do I know?) but get the U.S. completely wrong -- or do a good job on American English but go completely over the top on (or show very little understanding of) the UK conversion.

I am trying to wade my way through these and glean only the best from each, but as my knowledge of UK English stems largely from my keen appetite for 19th c. and earlier English novels, I am not terribly confident that I know how the 21st c. English reader will expect a computer data sheet to read.

An English friend brought me a pretty good dictionary (Chambers) of UK English, but Chambers seems to be more US English-friendly than I believe this company's English staff want me to be (e.g., the dictionary converts most words I think should end in "-ise" in UK English to "-ize" claiming that "-ise" is old fashioned. If that's actually true, that's fine -- but I rather suspect it is not true. My ten-volume Oxford is at the other end of the spectrum, but then again it's even older than I am, so that's hardly surprising.

So...can anyone recommend a book or a Web site that covers this subject with an equal amount of erudition regarding both versions of the language?

Thank you,
Claire