Saw this at Asda Greenhithe yesterday, a good 4p cheaper than anywhere else local. No vouchers needed.
The money you save on a tank you could use to buy a hot chick like the one on the right a bottle of blue WKD. After consuming said beverage, SHE WILL DEFINITELY SLEEP WITH YOU making this a win win deal.
Heat or ice it, makes no odds to me, I'm off to the pub