Bulk buy if you have the space. I bought 10 boxes of DSs favourite cereal a few weeks back when it was half price and it will last us for ages.
Do try the cheaper supermarkets if you haven't given them a go. Our Aldi is great for baked goods and I went into Farmfoods today and bought lots of the branded frozen foods we buy for about half the price of sainsburys. Seeds of Change organic sauce - £2.29 in Sainsburys - 39p!!! in Farmfoods.
chop up potatoes and veg really small when boiling to cut gas usage in half. Bulk cook to avoid duplicating on oven heating. Microwave when poss even if only to partly cook before finishing in the oven.
I second the childrens clothes point. Have recently had a couple of bags full from two different friends which are barely worn and will save us a fortune.
Pop into second hand shops for childrens books. Ours sells childrens books for 20p each or a couple of pounds for an armful. Or even better join the library.
Return products that are no good rather than throwing away. I have just had loads of vouchers from Cocal Cola for having a half empty can of diet coke.
Use the vouchers from magazines etc. Most supermarkets accept them even when you're not buying the product.
Sign up to Quidco for cashback on purchases.
Buy kids toys on ebay. DS1 recently fixted on something they no longer sell in the shops and so we had to buy it second hand on ebay. he loves them and doesn't know any different.
Swap books with friends and colleaagues.
Have a babysitting rota with friends.
Check your gas and electricty bills carefully whehn they are done on estimated usage. Our gas bill recently came through
as £638 and when I checked the actual usage and gave them a reading it came down to 322!!
Mix kids juice with water. Its better for them anyway.
Buy reusable nighttime pull ups for children who are out of nappies but still not going through the night. Saved us a fortune.
pick up presents in the sales and put aside for when needed.
Think that's all we're doing so far but will be pinching tips from others!