That's 40% off! Medieval Games is the prize game on Dealspwn right now. Looks promising for a Wii party game! RRP is £19.99, and i've been shopping around to see who has it the cheapest. Everyone seems to be selling it for £17.99, but it seems WHSmith has undercut everyone massively to sell it for £11.93.
Looks like a decent-quality party game and stocking-filler. Quidco is 4%.