Found 3rd Jan 2014
Biggest Persil small and mighty size you can buy. Everyone else either does it for £10 or £13, lasts a couple of months for a very large family. Comes in all three types, Bio, Non-Bio and Colour (you'll be lucky to find a colour one though). Don't know when it's going to end but doubt it will be down this much by the end of the month. In-store and online.