The document classifies businesses into three sectors - primary, secondary and tertiary - based on their activities. The primary sector involves extraction of raw materials from land through activities like agriculture, fishing and mining. UK Coal is the largest mining company in the UK, employing 2,900 people and supplying 5% of the country's energy needs. The secondary sector processes raw materials into finished goods through manufacturing and construction. Dawes Cycles produces various bicycles across the UK while Roger Lascelles is the largest clock manufacturer in Britain. The tertiary sector provides services to the public and businesses, such as retail, transportation, healthcare and entertainment. The Bank of England acts as the central bank and regulates the country's financial system, working nationally