Somerfields supermarkets. So either it is in production, or they have a huge stash of it, 'cos my ma buys it regularly. I saw a jar in her fridge only last week...
I'm in Liverpool. I've just phoned me mum to confirm, and she reckons she gets it in Kwik-Save, Penny Lane, no problems. Check where you live,- they can't just have it at one store?