writhing with fits of laughter, you guys are so funny!

...seriously if you really want qualified help, the best source of correct UK English today is the plain English campaign by the BBC, and those who supply it with talent, to-wit editors of UK English popular newspapers, and others in the UK who are doing that type of work. But, don't be fooled into getting any Pom who sounds like they know what you need, for example, a proof reader with a romance-novel mill would not be any use at all to you.