Most workers are entitled to be paid at least the National Minimum wage. The amout depends mainly on your age and on whether or not you're an apprentice.
National Minimum Wage rates
Under 18: £3.79 an hour
18-20: £5.13 an hour
21 and over: £6.50 an hour
Apprentices age 16-18 or 19 or over and in their first year. £2.73 an hour
These figures are normally reviewed in October.
For more details, use: www.gov.uk/national-minimum-wage/what-is-the-minimum-wage