Good flight search website with flexible dates option?

Whats a good site to use to book flights from in the UK? Ideally i'd like to use one with with a flexible dates option - i'm sure travelocity used to do this but i can't find it on the site now. My dates are flexible and i'd be prepared to go on whatever day was cheapest so it's annoying having to search each option individually if you know what i mean. Much better to tick a flexible dates option and have them show you which days are cheapest to travel out on and return on. Thanks!

Answers:
Most of the airlines' own websites have this feature. Also try http://www.expedia.co.uk I'm sure there are others as well. Google is your friend.

If you're REALLY flexible, then try bidding on priceline.com
http://www.skyscanner.net will let you search all budget airlines for a whole month, so if you're looking for Europe flights that is the best.
Travelocity still offers the flexible date flights. Go to their website and under the "To" field there is an radio button to choose flexible date.
Have you checked travel deals site such as travelzoo?
try aboutflights.com
expedia.com

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