My standard rates for academic proofreading are as follows:
£10/1000 words for documents written by native English speakers.
£14/1000 words for documents written by second language English speakers.
20% discount for all documents over 20,000 words.
For proofreading and copy-editing on other projects, I am happy to provide a quote based on the standard SfEP guidelines for freelance copy-editors and proofreaders.
I also offer the option of payment by instalments, which can be handy if you need me to look over a long piece of writing. Please note, though, that the 20% discount is not available with this option.