Avoid this bunch of chancers. The 'Survey' is in fact a salesman who operates in 1970's style. The sales pitch is 'Commit today and we can take £6,000 off the cost of your battery, but this offer only lasts whilst I am here' I mean , talk about hard sell, i really feel for those people that get pressurised into this, this should be illegal. Any offer that expires when a Salesman leaves the door and is not open to scrutiny is clearly not a great offer, otherwise they would allow you to look around. When i said i would not be committing today, they would not even give me a quote. The guy even had the cheek to say 'I wish i had known, i drove an hour and a half to get here'. Solar energy is a commitment and should be thoroughly researched before any commitment is made. Steer clear of these cowboys.