When filling the kettle, only put the water you need in it. It's better to boil twice at minimum than over fill it to be ready for the cuppa.
Libraries are a great source of kid's toys, DVDs and most have space, power points and free internet to use. Recharge your mobile devices there.
There's growing numbers of trade groups on facebook to exchange home grown foods in exchange for labour, excess junk or your own grown food among other stuff.
Also try the 'leg up' groups that can help, and often have where you can get cheap food.
Write down what you spend where. There's free apps for this stuff if you prefer using technology. Actually seeing where your money is spent is really useful.
Put the plug in the bath if you have a shower/bath - use that water for plants or flushing.
Compare your electricity supplier. There's gov websites to show how much you could save getting away from the big company.
A cheap as chips/budget shop coffee travel mug will make you feel like the rest of the crowd sipping through their lid but let you use your home brand caffeine fix of choice.
Cheap as chips/budget shops are good for buying lunchables for school kids. You can buy either the smaller packets of stuff or the bigger packets and a container to send them to school with.
Rice is cheap, and easy to flavour. Pasta & melted cheese can be another cheap option. Use frozen or real veg in it.
Nearly all washing powders work the same, regardless of what active ingredients they advertise.
Shaving razors will last months if you use an old toothbrush to clean the grit in blades.
Track when your local shops do their mark down specials, often early am or just before close.
Selling stuff on gumtree or craigslist doesn't cost. Selling on ebay does.
