NOT the Sheffield company with a similar name.

This company has a London office registered address, a Carlisle mail forwarding address and is online presence only. I strongly suspect it is East European due to the times I received emails.

The shed was delivered on time, self assembly, and some screws were missing. They did forward me spares a week later so I have given them two stars for that reason.
However if you think you are saving money think about what may happen if things go wrong, with no actual place to go to what would happen if they simply ignored your emails?
AVOID, pay £50 more and use a real retailer where you can complain to - if you need to.