I'm new to this so apologies in advance.
This deal is for the Wii Fit Plus and Njoy board bundle - £59.71 if you can collect from selected stores or £64.71 (£5 extra) for standard next day delivery (if ordered before midday). There may be some vouchers knocking about for discounts or free delivery and of course you get Clubcard points (double at the moment)
There is a better description of the board itself on Amazon which says:
* Compatible with Wii Fit
* Electronic Scales with LED Display
* Built-In Speaker for Scale Weight
* Bluetooth connect to the Wii Console
There are also some flashy lights on the corners if you're into that sort of thing.