FIX MY WORDS:
COPY EDITING PROOFREADING & SCREENPLAY APPRAISAL
PROOFREADING

Proofreading systematically irons out any errors in terms of punctuation, spelling, grammar or formatting issues.
Simply using a spellchecker is not enough. Instead of relying on fallible software, your work is minutely scrutinised in a hard copy printed from the file that you supply.
Particular attention is paid to specific house styles, such as the so-called Oxford comma, and to language variants, for example UK English as opposed to US English.
The charge for Proofreading is £8 per thousand words. A 50,000 word manuscript costs £400.