I always In addition to the energy club also use cash back sites and compare the rates myself , I have just moved to eon and there standing charge is only 6p per day down from 13p with shell.
if you are paying a high daily standing charge before you even use the energy you are losing before you start.
the days of nil standing charge are also long gone it seems.
i also take practical steps like using LED light bulbs but my best investment was the TADO heating, it has brilliant Geco Fencing so knows when I am away and automatically drops the heating until I am home / close to home.
my current estimate from Eon for gas and electric is £35 a month (two bed house, I live alone but do work from home 1 day a week and have to my children over every weekend playing consoles and charging phones).
report from Tado said it saved me 53% through turning off when I was away from home In November.