OK so that stereo doesn't actually have an ISO connector, it's literally just a bundle of loose wires, so you'd need to manually wire it into the harness from the fitting kit. If you're not comfortable doing that, I'd look for a different headunit.
Also, for £14 I'd be very concerned about the quality, it'd be as likely to catch fire as anything else!
Finally, whether or not you noticed, it's worth mentioning it doesn't have a CD player.