The Double Premium Pergola and Decking Kit in Rustic Brown is a work of art. It's double and it's premium, what more do you want in a pergola? The pergola is super sturdy with the rafters and runners slotted into the halved joint. To be honest, if you don't buy this, I'll follow you around the internet promoting this product util you make a pity buy, so probably best to go ahead and get it now
 
Easy assembly with the minimum of tools required.
High quality pressure treated Northern European Redwood.
Solid 95mm x 95mm corner posts.
34mm x 140mm Runners and Rafters.
Corrosion treated, heavy duty fixings.
Decorative post pedestal panels included.
Custom sizes available.
 
Here is the link to the assembly instructions