As a citizen of Sweden you are not required to apply for visa to study, work and live in the UK permanently or temporarily.
Anyone from Sweden wishing to study in the UK is not required to obtain a Student visa before commencing any course.
An Ancestry visa allows those with a UK-born grandparent to live and work in the UK.
I am not from Sweden: UK Family Visa Assessment
UK Citizens and Residents in Sweden who require consular services can contact the UK Embassy in Sweden through the contact details listed below: