Period Number of Oil Systems Installed Average grant cost (£) Total Cost (£) 2001-02 107 3,609 386,193 2002-03 564 3,923 2,212,672 2003-04 1,585 4,478 7,098,785 2004-05 2,055 5,057 10,393,454 2005-06 1,785 5,002 8,929,373 2006-07 4 757 4,990 3,777,454 2007-08 695 5,235 3,638,325 2008-09 3 119 5,219 621,061 Total 7,667 N...