Employment rights
If you're in work, you have certain rights as an employee. Read about:
You'll find more information on employee rights on the Gov.uk website.
Trade unions
A trade union is a group that works to represent workers in discussions with employers. Those discussions might include negotiations on pay and conditions.
There is advice on the Gov.UK website about how to join a trade union, and on the Indeed website you'll find information on why you might want to join a trade union.