They are fake, the website looks pretty bad and the web address is unusual.
Fake Uggs are really not worth it, those boots wouldn't even be worth the £60 you pay for them. I have had Uggs that are on their second winter and are still looking good, have held their shape, not went down at the ankles etc. Dd was bought a pair of fake uggs, they looked pretty good, but the quality wasn't the same, they didn't feel as good inside etc. They also didn't last at all.
You would be as well buying a pair for £6 from Primark as you would be buying from that site, sorry 