I love this question. Confusion often surrounds the various creams that are available. With the plethora of cooking shows on the TV these days, we often hear, particularly English chefs, use the terms Double and Single Cream. The confusion stems from many years ago when King Island Dairy called the really thick cream that is manufactured there "Double Cream". This product has a fat content of between 48 and 53% and is quite stiff. For the sake of this exercise, lets discard this product from the answer, as it is now called pure cream.
Single cream is 35% fat cream with no thickening agent, like gelatine, added. Double Cream is 45% Cream with no thickening agent. You will need to read the fat Content on the pack to work out what is what as in Australia, the labels do not mention single or double. Single Cream is usually called "pouring cream" and is widely available in Supermarkets. To my knowledge, there is only one manufacturer of what the English chefs call Double cream and That is Bulla. You may have to look hard to find it, particularly outside of Victoria. I think its is called Bulla Pure Cream, but remember, check the fat content.
We only sell Bulla 45% Cream in 5 litre Bottles.