You could also join Wiki's very own group called "Money Savings Ideas". You can find this by going to the "Community" tab at the top of the hompage, and scrolling down to "support groups" and clicking on that.
My kids are all involved in Sea Cadets (girls and boys) - they have some great friends and events run by the unit are inexpensive - the experience they get can be really worthwhile. Every time the uniform is too small it is replaced by the unit.
Maybe not what you had in mind but food for thought.
For ways of saving money on food depends what time you hit the supermarket, if you go after 8pm you can save quite a bit in their reduced section.You could pick up a pack of mince for around half the orginal price, seems cooking in bulk then freezing food is another way on saving money on food.
Look out for the vouchers in the news of the world pretty sure there doing another 1 this sunday save £5 when you spend £30 or mre in Tesco.Tesco club points excellent way to get vouchers and save them for xmas.
Need the ages of your children to think of free entertainment for them.