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You might follow some links here: UK style guides
There's the Guardian style guide
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I was going to suggest 'The Complete Plain Words' by Sir Ernest Gowers as an old fashioned (i.e. printed) possibility - my copy dates from 1963, priced 3/6.
When I looked to see if it was still in print (a revised version is) I found it as a free download - not quite an online guide but getting closer...
http://www.scribd.com/doc/217456602/Complete-Plain-Words-Sir-Ernest-Gowers-pdf
Can anyone recommend a good, authoritative, online guide to grammar (English usage)?
@Oliver Schick?