Chook is a very 'Australasian' expression - certainly not reached UK despite many features (I suspect) on Neighbours!
Secret: Major UK Supermarkets roast chickens in-store and produce tons of fat as a by-product. At one store the drainage system couldn't cope with the heat of the fat (plastic pipes - doh!) and the fat leaked into the floor void for some time resulting in 6" of lovely fly food. Yum Yum!
R2