If you are on a student visa and have permission to work, working hours in term time must not exceed the limit stated on your digital status during term-time, and you can work full time outside term time. Term and vacation dates are set by the course provider and it is important that you check these to ensure you can comply with any limits on work. Your university, college or school may impose or recommend further limits which you should not exceed. Further information about working as an international student can be found here Working as an international student

If you are on a work visa, your permission to work will depend on the type of work visa. Some routes allow you to work anywhere. Other routes restrict you to working in a particular job for a particular sponsor. If you have a sponsored visa which allows you to do supplementary work, this must not be for more than 20 hours a week, and you must still be doing the job you’re being sponsored for. Check your visa decision or the guidance for your route for more details.

You can find out more information on the guidance on maximum working hours at Maximum weekly working hours: Overview - GOV.UK and on student visas at Student visa : Overview - GOV.UK