The Premium Lean To Pergola by Rutland County is an outstanding piece of work. Oh hang on a minute. Did you know thata Rutland County are one of the leading UK Pergola manufacturer? No? Neither did I until I read their website
 
This lean to pergola in rustic brown contains rafter beams that seem to seemlessly slot into the frame. This gives a look of prestige, sturdiness, Roman like. This is a pergola for the ages. Get one of these and the neighbours will start inviting you round to their cocktail evenings, but don't go. Play hard to get. Tell Janet and George that you're too busy taking selfies with your new pergola
 
Here is the link to the assembly instructions