I found Sun Gain Solar very easy to deal with. Unlike some other companies whom I asked for quotes, they responded promptly and followed up with additional information and, indeed, offers. Whilst most of the quotes were in the same ball park, I went with Sun Gain because of their stronger workmanship warranty and because of their good commiunication.
They were able to install within a fortnight and the installation went smoothly, without hassle. The installers left the place tidy – although they did put some bits of roof tile in the recycling bin. Two friends have asked about the install and I’ve had no hesitation in passing on Sun Gain’s details to them.