You can find official guidance on employment rights on GOV.UK, including information about pay, working hours, holiday, sick leave, parental leave, dismissal and discrimination. Start with the Employment status and rights section, as your rights can depend on whether you are an employee, worker or self-employed. If you are unsure how the guidance applies, Acas offers free advice and support, while employment matters in Northern Ireland are covered through nidirect. For a serious dispute, consider speaking to a solicitor regulated by the SRA.