Any Fuel - Spend £10 and get £2 cashback.
If you are a TopCashBack user, you can fill up between 14 & 21st Feb, take a photo of your receipt and upload it (see link below) and you'll get 2 quid back for every tenner you've spent on fuel.
http://www.topcashback.co.uk/SnapAndSave/Offers
For a typical £50 - £60 fill this will give you £10 - £12 back to your account and is equivalent to at least 25p off every litre (maximised if you fill to nearest £10


There's also an Android and an ios App if you want to use your smartphone.
There's other offers available (if you can be bothered) off your shopping on the same link, like ice cream, bananas, etc.