IT HAS NO BACK!!!!
The description of this unit clearly states it has a back. It does not. Wayfair offered to waive the return carriage charge or I could have £5.00 or so discount, likely the carriage cost for them. I kept it. 
The unit is a little tricky to construct. You must use a PH driver not pozi. A rubber mallet helps. If you have an older relative experienced in putting together MFI units from the 70's get them to help as it is made to the same standard.
I cannot fault Wayfair customer service in anyway, just the product description.