During the 1970s, around 2,500 workers were at Melton and 200 at Peterborough and produced around 400,000 tonnes of animal food a year and virtually doubled production. The raw materials came from the Oakleigh Manufacturing company in Ascot. Around 3 million cans were used per day at the Melton plant; cans were delivered every 30 minutes, to limit storage space, from the Metal Box company (which became Novar plc). At this time, Whiskas was the company's biggest product by sales closely followed by Pedigree Chum, although more in volume was sold of Pedigree Chum. Whiskas sold four times as much as Kitekat, although only half as much was spent on advertising Kitekat as Whiskas.