Of the three installers I looked at, Roxon was ultimately the company I decided to go with. As a company, they seem to have a decidedly pragmatic approach to solar system design, advising sensible choices on the many possible combinations of panels/inverters on the market to provide a system that's relatively inexpensive and of good quality, whilst yielding an excellent return on investment. The man (Ben) who performed the initial quote was very good, understood the kind of system I was looking for immediately, and quoted very quickly - even on a Saturday, after I decided I wanted a minor change to the initial quote. The other thing that helped decide me on choosing Roxon was that they use their own scaffolding towers that they setup and take down the same day. By avoiding paying a third party for standard scaffolding that's normally up for a couple of weeks, you immediately save about £500 from the quote (plus a couple of weeks of unnecessary scaffolding on your house). The only reason I didn't give them 5 stars is that when it came to installation day, they broke off the corners of the overlaps on a couple of my roofing tiles (I know this, because I found the pieces on the floor). Cracking a couple of tiles is basically inevitable when spending a day walking around on a roof, and whilst they insisted that my roof was still watertight because they'd siliconed the exposed gaps, I was rather annoyed at the short-sightedness displayed here. Sure, silicone sealant is usually good for up to 20 years, but roof tiles cost about £2 each and last ~100 years. Why not just bring some replacement tiles?! In every other respect the installation was faultless and I'm very pleased with it.