We look at all the expenses we pay yearly (Christmas, holiday, birthdays, Tv license, car tax, house and car insurance), work out the monthly cost and pop that in savings each month straight after pay day- for most things like that it's cheaper to pay yearly than monthly and it makes it easier to budget.
We also add things like new school uniforms each year, a delivery of logs, repair/replacement of white goods, boiler service etc. Means that we don't have any surprise expenditure and our normal savings and fun money don't go on boring stuff.
Be less heavy footed when you drive, saves lots of fuel. And don't drive when you can walk, all those little 1-2 mile trips add up to lots of fuel. Plus you'll be fitter and I find walking much less stressful than being stuck in traffic.
Learn to cook and have lots of cheap and easy meals in your repertoire so you aren't tempted to go for takeaways/ready meals.
Take your own snacks and drinks when you go for a day out and learn to say no to requests for ice creams etc! A friend and I decide in advance if we're feeling frugal or generous that week when we take the DC out so we can agree to pack a picnic and refuse to buy snacks vs getting a meal out together. Means neither side feel they are missing out.
Likewise, give the DC pocket money, then when they ask for games, V Bucks, snacks etc then tell them to use their money. They ask less and learn to budget. My DS can now work out how to get the most crisps and sweets for his money 
I know lots have said it, but use the eco setting on your washing machine and reduce the temperature. I've been washing clothes on 20c and my washing is coming out just as clean- a full load at 20c uses about 300w in my machine, washed on the regular wash 40c the other day and it was 900w. The 40-60c eco wash (towels and bedding) uses up to about 500w. Eco washes use less water so there is less to heat. To make up for that they soak for longer, heat more slowly and agitate the washing more (turning the drum uses minimal energy, most of the energy is used to heat water), hence they take a lot longer. Also use the eco wash on your dishwasher.
Line dry where possible but if not dry in a room with ventilation or use a dehumidifier to prevent damp. Damp air is harder to heat dk will increase heating bills! We are very lucky to have a utility room with an extractor fan that runs continuously at a cost of about £4 a year. Also has a humidistat that kicks in if it senses high humidity.
Reduce how much you wash- sniff test and air clothes between wears. With our bedding, I wash the pillow cases a couple of times a week when I have another wash on, the sheet is washed after a week but I air the duvet and only change the cover on that once a fortnight. You could have a sheet between you and the duvet and get away with changing it even less but our cats sleep on our beds and often leave mucky paw prints. Just means a bit less washing and less work. All our sweaty sports kits mean we still do loads of washing though! But according to the app on my washing machine I still spent less than £3 worth of electricity using my washing machine in March.