Write down your monthly allowance and as you spend it write it down. Take note of any money that has been spent, either in cash or direct debit, each night. It really, really makes you think. I halved our shopping today by being really, really aware that every penny counts.
When you are thinking of buying a gift for someone, halve the amount you would normally spend. And don't spend more than £1 on a card.
If you have people you would normally give a £5 box of sweeties to at Christmas then change your tradition. Give them a small £1 and a card with a £1 lottery ticket. Or better still, tell them you have changed the tradition and do they want to come over for a coffee instead? They will probably be relieved.
Make a Christmas gift spread sheet now. Write everyone's name, then choose what you are going to buy them. Source it as cheaply as possible. But it NOW. Don't buy anything else when all the tempting Christmas stock hits the shelves.
Buy second class stamps for your cards and post early.
Bulk out all meat meals with beans and veg, especially chillis etc.
Soup and pudding one night a week. But don't call it soup and pudding night. Just do it.
Unlike what other people have said, go out for a coffee and a walk in the park for a treat. Cheaper than the cinema.
Make your own bread, apparently Hugh F Whitting-whatever has a good recipe online, or so my brother says. A good weekend activity for your family.
Go for walks and collect things, then make collages.
Halve the amount of shampoo etc you put in your hand before using.
As someone said above. Don't take your purse out.
Meal plan. And buy only what you need.
Will keep thinking...don't be afraid to say 'can't afford it.' Most people will be relieved. You and your partner agree to have very small Christmas gifts, a box of chocolates or whatever. And stick to it.
Good luck!