I use the suggested rates published by the Society for Editors and Proofreaders:
www.sfep.org.uk/pub/mship/minimum_rates.asp 

And/or the rates recommended by the Freelancers’ Fees Guide:
www.londonfreelance.org/feesguide/

To talk over the job you have in mind, how long it might take and how much it would cost, contact me »