Microsoft Designer Bluetooth Mouse was £24 now £12 in store, possibly national but found this in ASDA Handsworth in Sheffield.
Note it does not include a USB dongle you need to buy this separately or use the built in bluetooth on your PC/laptop. Stated as compatable with:
Windows 8/8.1 and 10
Android 4.4 and above
Mac OS 10.10+
Reading reviews on Amazon (£20.99 there) it does not work on (some) windows 7 PCs.
PS, if the image is on it's side that is the HUKD website not the picture. Couldn't get it to display any other way.