The Government has recently published guidance relevant for people with property or trading income. If your gross trading or property income is below £1,000 and you’re not registered for Self Assessment, you won’t have to declare this income on a tax return, but you must keep a record of this income.
https://www.gov.uk/guidance/tax-free-allowances-on-property-and-trading-incomeYou can get up to £1,000 a year tax-free allowances for property or trading income from 6 April 2017. If you have both types of income, you’ll get a £1,000 allowance for each.