Spotted today in Addlestone. Seems to be discontinued item, original price around 6 quid I think, but now down to £1.71. They had Lemon and Berry flavours in 385g tubs.
I use a lot of isotonic drinks when I am doing sport and I find them better and far cheaper to buy in powder form. They reckon the tub will make 5.5 litres of drink. I bought half a dozen which should last a while.
It's made by Nestle and is a carb mix to give energy and isotonic to help hydration. Per 100g it gives 95g of carb of which 65g is simple(sugar).
First deal so hope it is of some use to others! Not on Tesco website so can't get a link to a picture. Seems to be available on a lot of muscle/fitness sites at around the 6 quid mark.