The legal minimum in the UK which just about everyone is entitled to is 28 days paid holiday assuming a full time job [1]. That can include bank holidays which are 8 per year for the vast majority of the population (1 or 2 more for Scotland and Northen Ireland I think).

For example, my first job was 25 days + 8 days of bank holidays and then you could earn up to 5 extra days if you stayed with the company long enough. Other jobs were all 22 + 8.

[1] https://www.gov.uk/holiday-entitlement-rights/entitlement