Add Zambia to the list of 'designated countries' for driving licence exchange

Including Zambia on the list of recognised countries could allow eligible Zambian licence holders to complete the exchange process without retesting, bringing Zambia into alignment with other approved countries. The UK currently exchanges licences with several Commonwealth nations, some of whose testing standards and infrastructure we believe are comparable. Moreover, Zambia drives on the left side of the road, which could minimise adjustment for drivers and further support safety compatibility.