I'm a native speaker of British English and a member of the Chartered Institute of Linguists. I have an exceptional eye for detail and have proofread my employer's brochures in the past, before they went to print.
I have one question - if I come across a sentence structure that either isn't correct or, while technically correct, doesn't sound natural, would you like me to change it, or are you more interested in ensuring that the spelling and punctuation are correct?