Sorry if I sound negative about this thread, but I consider this cheating. Especially if the essay is for an English lesson.
If presentation wasn't such an important part of an essay, then no one would bother asking for help on rewording and proof reading them, and I think this thread is unfair to the people who write essays themselves, and don't get someone else to proofread, fix spelling and grammar mistakes for them, etc, before handing in the essay.
I'm fine with people offering advise on what could be improved with a persons essay, as long as it's only advise and the person handing in the essay rewrites it all themself. But, to get someone else to proofread and rewrite parts of an essay for them is cheating in my book. This is because the person could just offload their essay to someone else, so they can go out with their mates and have fun, whilst other people are forced to stay at home, not having fun, and probably lose some sleep from proofreading and rewording their own essays.