well, its finally up.... BUT made of the cheapest rubbishy timber, warped, with splits, huge knot holes, and impossibly flimsy construction. I spent a further £50 on extra screws, and metal brackets to strengthen the joints.  Otherwise I would imagine in the first gust of wind I'd be left with a pile of matchwood!  
The instructions reckon 2 people will take 1 hour to build it - excluding fixing the metal post brackets, it took 2 of us about 4 hours to assemble it... 
Can't honestly say I would recommend it, and I certainly wouldn't buy another one!