I do not know how legit the place is, but from what I found out I was not ready to splash out the considerable amount of £££ towards an unknown work. Possibly also being lied to.
In response to your review above, I am very proud to say that yes, this company is owned by English speaking citizens. If someone has assured you that the work can be done within 24 hours, then that assurance was given with a certainty.
Your research about the location of the business need not to be suspicious because the business is very much legitimate unlike others out there. Read carefully for yourself: uk-assignments/about-us.php
It could have been a co-incident that we missed your call on the "blocked number". However, this is to show you that we are not £££ hungry or we would have ensured that we answered the "block number" since we would be unable to give a return call. Why and for what reason would we be lying to a potential customer?