I would kindly advise you to stay away from any of them you depicted, since you'll find many of those names popping out on this forum in a very negative context, especially the first two named by you. They seem to be running a fraudulent scheme, at least it's my impression based on the comments of other users.
The private guy you mentioned - i can't comment on that, however there are some writers on this forum which state that they tend to provide a quality work, you might try here...
For the fourth company, I am not sure have I ever herd of them....
There is a user called WritersBeware who has done extensive research on writing companies, it would be great to hear if he has encountered through his investigation any signs of evidence that uk essay service operates a fraudulent scheme?!
cheers!