I moved to Bridport 13 years ago, since when I have fitted 133 (and counting) solar hot water systems. I also upgrade, repair and service existing systems, as well as help and advise DIY-ers to fit their own.
I operate under Dorset County Council's 'Buy with Confidence' scheme. All my customers are given a (postage-paid) feedback card to send to the Trading Standards Service, where my approval rating is monitored. Visit www.buywithconfidence.gov.uk for my listing (search for 'solar & renewable energy' or 'heating-general services') or www.dorsetforyou.com for details of the scheme.