Just went to the WhiskyShop they had Supernova on their shelf was about to buy however the box was badly damaged.
They said it was the last of the 6 bottles they had. I thought this was on General release 6 bottles and the lack of buy option on Ardbeg. com site is strange.
Got home and bought a bottle through a cashback site for £5 cheaper than the whisky shop anyway.
See link to the TWE for 2.5% cashback.