Got some from Asda yesterday - it is usually near the other cheese but you do have to search for it.
Also bought some from Tesco on Thursday - had to ask where it was but again it was near the other cheese but they only had one left.
I'm not eating it - I gave my MIL a taste of the SW cheese cake when I made it the other day (I didn't care for it ) but she loves it and asks for one every afternoon !!!
In both shops it was Meadow Churn - 250gms - small oblong white plastic tub.