Please click the following link:
https://mydvla.dvla.gov.uk/_/staff-handbook/staff-handbook-home/staff-handbook-part-a/chapter-2-a-working-in-the-agency/chapter-22-a-working-hours-and-attendance/chapter-2218-2224-a-term-time-working
If any links do not work, please contact HRadvice@dft.gov.uk