This is quite an old article, but I've found it really useful. I can't link to it, but it's the Guardian's 'Take control of your trolley' article from 2008. Lots of great tips when supermarket shopping with tips on how to resist the urge to overspend.
My favourite one, which i had never realised before, was never go shopping when you're hungry!
My favourite one, which i had never realised before, was never go shopping when you're hungry!