After calling suppliers for quotes, I found there were several which were similarly priced. I chose Stewart because he gave genuine, helpful advice - no pushy salesmen- he listened to what we wanted and came up with the solution to fit our budget.
I couldn't be there for the installation of the windows, and from experience I am cautious at leaving people to just "get on with it" while I'm at work; but was comfortable and confident that Stewart was doing a great job, and every evening was pleased to see the progress being made.
The overall result was great, and will continue to return to Safehouse and Stewart in the first instance for my windows and doors work.