What records do I need to keep for revenue to prepare my accounts?

A full record of income and expenses is required, typically sales and purchases invoices, bank account, details of all cash receipts and cash payments, and any other relevant information. Either a manual or computer system may be kept, though a computer system is more relevant today. An up to date proper set of records can really help a business save money,

How long must records be kept? 
Records must be kept for a minimum of 6 years