As another person has already mentioned, you can use moneysupermarket.com, and you could also try Vouchercodes.co.uk. However, my favourite site for all types of money-saving advice and for vouchers is Martin Lewis' MoneySavingExpert.com.
(Source:
http://www.moneysavingexpert.com/site/martin-lewis-biography)Martin Lewis is a UK financial journalist and TV presenter, who prides himself on being "the consumer champion".
If you sign up for his regular email, you won't get deluged by spam emails every day (unlike with many other voucher sites), but you will get regular advice - from a financial expert who is generally well-regarded - in how to save money on just about everything.
The free email also includes details of loads of the latest money-off vouchers, enabling you to make savings on a wide variety of products from lots of different companies, as well as on meals in a wide variety of restaurants.
Another great aspect of the site is that it has lots of separate, easily-searchable sections, which deal with just about everything to do with money.
These include a whole section advising people how to deal with banks and other financial institutions which may have mis-sold them various financial "products", such as insurance, and sample letters to start the process of making a complaint are even provided.
Money Saving Expert also offers excellent advice on everything from student loans to managing your budget, as well as a benefits calculator.
Basically, you can find pretty much everything you'd need to manage your money as effectively as you can in one place - important for all of us, in a recession!