Never eat at a chain restaurant without checking for a voucher - there's nearly always one available. Independents are also often cheaper, especially on drinks and even better if you can find a BYO restaurant and take your own booze.
Never pay full price for all those branded goods that are always on offer somewhere. Instead of big supermarkets, try Aldi, Lidl, Wilkinsons, Home Bargains, Pound Shops etc.
Always check for a discount code or quidco/top cashback if shopping online.
Shop around annually for insurance, gas and electric, broadband, tv etc. You never need to pay full price for any of these. Don't have expensive pay TV if you can help it - Now TV, Amazon Prime or Netflix plus freeview gives you most of the channels for less than a third of the cost.
Watch how much you spend on food out of the house, this can be loads. Coffee at McDonalds is at least as good as Costa/Starbucks and about half the cost.
Sign up to the Moneysavingexpert weekly newsletter and read it's budgeting guide - loads of tips. I don't try particularly hard but this week I've had a free £35 in M&S vouchers by signing up to it's credit card.
Eat less meat and eat cheaper cuts of meat - pork shoulder, chicken thighs, ham hock. Much cheaper and tastier than chicken breasts. If you eat a lot of chicken, buy a whole carcass and cut it up yourself. A whole chicken doesn't cost much more than 2 plain breasts and you get about twice as much meat.
Make meat the flavouring of a meal, not the main focus. Lots of vegetables and pulses is also healthier too.