This is the website which the BBC and national press seem to refer to almost daily:
http://www.moneysavingexpert.com/
My main tip is to examine how much you're spending on food. It's easy to spend far more than you need through buying convenience food (which you could cook from fresh far cheaper), buying sandwiches for work (rather than making them yourself) or eating out (when you could take sandwiches or eat at home). When I had a regular income I probably spent about �30 a week on food. (I know people, who eat out a lot, who spend at least 3 times that). Now that my income is not as stable, I've found that I can survive on �5 per week for food and eat well on �10 per week.
Also check that you're not wasting money on heating. Make sure that your room thermostats are set to 20 or 21 Celsius, not above, and ensure that you only heat rooms that are in use.
The most important thing though, is to make a list of your current expenditure. Review it and set yourself targets for future spending. Then maintain a record of all your expenditure, and check that you're meeting your targets.
Chris