It seems there are going to be reductions in the value of points earned.
They are also reducing the value of vouchers by a quarter too. For example 100 points presently earns a £4 voucher, from the 6 December, that falls to £3.
And there are more changes planned.
Perhaps time to look elsewhere?
Utility Warehouse members receive 5% through their CashBack card, which can be earned through almost 40 High Street shops and over 1500 stores online. Details here: http://www.go-fast.co.uk and click CashBack card top right hand side of page