pearl barley in stews, soups for autumn / winter
less meat - I'm with whoever said that - we eat meat or fish pretty much everyday and we just don't need to.
always check out specials at the supermarket - as MaMoTTaT says the bulk buy is usually the best but sometimes on a buy one get one half price or even just odd pricing it's cheaper to buy two small ones that one big one - tescos used to do this with their tea bags - it was vastly cheaper to buy two boxes of 120 bags than one big box 
again at the supermarket - look o nthe reduced aisle on a monday morning if you can - meat from the weekend that you can freeze (how many of us buy meat fresh everyday and never freeze it anyway?).
Always speak to your insurance company before you automatically renew - they are constantly bringing out new policies etc and their biggest source of income is people that just automatically renew rather than question why their premiums are going up, even just a little bit.
Do you have a grocers near you, or for instance we used to live in Clapham and in Tooting there were large fruiterers - you save such a lot of money shopping there rather than at the supermarket for fruit and veg.
Eat seasonally - why buy tomatoes in the middle of winter when they're imported and often taste watery anyway? It's so much cheaper to eat fruit and veg that's in season.