Gave the fridge a massive clear-out after watching this video. Discovered the Kefir sitting in a jar at the bottom of the fridge. Resurrected it with some milk and time out on the bench to warm up and it has come back to life and made a tasty Kefir drink. This is meant to be one of those great health foods that put all the right bugs in your gut.
If anyone (local) wants some of the culture to get it started give me a buzz (use the Contact Us link).