Do not use this company. They fitted my in-roof solar panels (and reroofed one side of my slate roof by arrangement) in late October 2015. During fitting I had a lot of water come in during heavy rain as a fitter had put his foot through the membrane. A week later I went up to the roof and looked at the panels and found one to be badly scratched but they will not even look at it, yet alone replace it. There are pieces of the membrane which have not been trimmed off flapping in the wind and they removed the lead flashing from around the chimney and did not replace it. The scaffolding stayed on site for over 2 months after fitting.
They do not feel the need to respond to my complaints and dismiss them out of hand, and I am now looking at legal action to recover some of my costs. Nightmare, avoid like the plague!