Which uk universities offer january session for international students ?
Do you mean admission in January? Because in that case, I believe none. Entry into UK universities for degree courses is in September at the start of the academic years. Only a few diploma courses (eg: diploma in nursing) have multiple entry dates. As for applying, while home students have until January 1st to apply for the next academic year where their applications must be considered, international applicants have until June 30th (with the exception of Oxford and Cambridge).
