use money saving expert, and uswitch, check your utility bills, pay by direct debit and make sure youre not paying for tv channels you could happily live without.
work out your available "spending" money for the week, take it out in cash and leave your cards at home.
menu plan, use your freezer, try to cook from scratch and dont buy convenience food. Buy own brand in preference to big names.
Take a packed lunch to work.
shop online its less embarrasing buying dozens of value tins, you can keep a tally of what your spending and you can take full advantage of (appropriate) special offers
try to mend rather than replace
get an allotment
use the library and the local park - they're free!
make a list of (non grocery) things you think you need to buy and shop around for them. Leave them on the list long enough and you'll probably find you dont need them after all - if you really do, try ebay and argos first.
dress in "vintage chic" - looks much better than high street anyway
dont buy magazines, daily or sunday papers. They'll only try to convince you you need things you dont. Read them online or read some of the books you've never got round to reading
buy pre-loved toys, books and clothes for your little ones. No-one, let alone your kids will know the difference.
Ditch the car - we save a packet without one
Make a list of supermarket value wine recomendations - its surprisingly ok buying a garish bottle for 2.99 called chilean white wine if you know Malcolm Gluck has given it 16/20.
use up all the bottles in your bathroom before you buy more shampooo etc. Try to buy bottles everyone can use.
Share baths with your kids and loved ones.
Stop eating out or going to the pub. Discover the joys of a cosy night in and an early night.