I wouldn't worry if they are from UK. A researcher can write UK English and use UK sources if you request it. Just find good company to do good work, it is easy to change spelling or phrase, it is hard to fix bad paper.

I haven't heard of them, I asked some friends here and they haven't either. I wish I could be more helpful.

I have used them to edit and one time to write. All my experience is good with them. At first it bother me that I couldn't talk directly to writer, but now I like that it just get taken care of without a lot of bothering me.

Is it ok to describe what happen? If say this happen and that happen, is that OK? I understand not to recommend, but is describe OK?

I just signed up for this site and it scaring me to death! I use XXXX sometime and that site has been good. Not super fast to email back, but always get back to me and take care of everything. I have use them to edit papers because English is my second language. I would like to know more sites, just in case there is problem, but so far so good, everyone nice and the work good.