Ruth and David were very helpful and efficient and kept in touch with us throughout the process, answering all our queries promptly.  We were given names of previous customers to contact which was helpful. The installation had to be done in two stages (and scaffolding erected twice) because of bad weather and there were no additional costs as a result of this, for which we were most grateful.  I have not answered Q.5 as the system has only been running one month, but it is working well, especially on the occasional sunny day in Skye in February!