A Permitted Paid Engagement Visa is available if you are visiting the UK for up to a month to provide paid advice.
This typically applies if you are examining students, serving on an interview panel, guest lecturing at a university, providing advocacy in a legal case, or working on a short term basis in the arts, entertainment or sport.
You can apply for a Permitted Paid Engagement visa if you are invited by a UK-based organisation, want to come to the UK to do specific paid work without having to be sponsored under the points-based visa system, you are from a country that’s not in the EEA and you meet the other eligibility requirements