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When do you want me to start? <a href=" http://buycheapsildenafiluk.com/female-viagra-to-buy-uk.html ">kamagraquick.co.uk review</a> An independent advice charity, EST estimates a typical cost-saving of £785 annually, in return for a £7,000 average investment in panels. This more than wipes out your annual electricity bill of £479, paying an additional 63pc on top. The Solar Trade Association puts the annual savings slightly higher at £823, largely because it has a higher estimate of how much you will use yourself. On this basis, the STA estimates a system will give a 12.5pc tax-free annual return over 25 years. The EST does not estimate returns but also does not dispute STAs claim.