Does a 15 year old in the UK need a work permit to do part time work in a cafe e.g on a saturday?

In the UK, a 15-year-old can work part-time, including in a cafe, but they do not need a work permit. However, they must have a job that complies with local restrictions on hours and types of work for their age group. Typically, they can work a maximum of 12 hours during school weeks and up to 35 hours during holidays. Employers must also ensure the work environment is safe and suitable for young workers.