This was a very disappointing experience. Both of our agreed times & dates for scaffolders were not met; no warning was given: we waited in all day & received telephone reassurance workers would still arrive. Nobody did, so we wasted a whole day in vain. Weather had been perfect. We then had to wait another ten days for a second appointment. Workers didn't arrive at the agreed time, and another series of phone calls brought the belated arrival of the installers mid-afternoon. By this time it was dark, the system couldn't be tested, and they rushed away without explaining how to use the system, esp. the monitoring dongle. Scaffolders didn't keep to their appointment time, and rushed off before we noticed the damage to our roof (roof tile broken leaving a hole to the elements), and shattered paving slabs, plus an incomplete & 'bodged' cable installation on our outside wall. Many phone calls & e-mails & missed appointments were required until a poor repair of our damaged brick, a new tile (which we had to supply!) replaced on roof, while it was over two months until our paving slab was replaced. We still await remedial work on our monitoring dongle, despite endless e-mails & phone calls & unfulfilled promises...