Will this mouse work on Mac OS?

Any mouse works on Mac OS X. If there are no drivers for Mac, you might not have all the advanced functionality. According to the specs on that mouse:

 

The biggest potential issue with special-purpose mice (like gaming mice) that have no Mac driver is tracking speed--some gaming mice have an unusually high DPI on the sensor, which causes them to track very quickly relative to a "normal" mouse, sometimes so much that even on minimum speed it's still faster than you like.

There's no easy way to say whether this will be the case with a specific mouse apart from trying it, of course. USB Overdrive will give you customization out the wazoo and support for pretty much any mouse feature, but it's not free, and if you're looking at a £12 mouse, it's going to cost more than the hardware, pointless unless you REALLY want that particular mouse.

Just glancing at that specific mouse, though, I'll wager that it's fine--it doesn't look like it has any particularly fancy features, and I've thus far only tried one mouse that didn't work perfectly fine without drivers.