Just been on Amazon - I have seen this game stuck at £14.99 for ages, but have just seen it on Amazon for £11.91 - BARGAIN :-)
Here is the product info;
Wii Fit Plus contains all the great features of Wii Fit plus all new features to make your workout more productive and personal, as well as some more great new fun games.
Wii Fit Plus will still enable everyone in the family to combine fitness with fun. Wii Fit Plus offers you even more understanding of your fitness levels and the new workout routines make it even easier to work on those trouble areas of your physique.
Wii Fit Plus still offers 3 key areas but each has been expanded to offer you more information about your Physique, all new training programs and additional exercises, as well as additional areas of your fitness to track as a family including the pets!