There are some great supermarket beers on the go. As Gaz says the NB Kveik is right up therem
Northern Monk Faith in the Futures is a current highlight for me, I think it's fantastic and for me it's the best on the shelves.
Other good ones from Tesco at the moment are the two Salt beers Huckabuck and Ikat.
Morrisons also has some crackers with Salt Tram and Northern Monk Transient both being great beers.
Room for both in my eyes, I had this Overtone last night form my local indie shop and it was incredible, just so juicy and tasty.