I am not sure that any vehicle related insurance issued in the UK will be valid outside of Europe and you need to take it out as you go along, either country by country or part of a continent as with a comesa in Africa. I would also have thought the premium would be so much that you would be better off putting the money to one side as an emergency fund to pay for repairs if and when needed.
You don't mention what type of vehicle you are planning to take, remember expensive bikes and cars are far less prone to theft in developing countries than they are in developed ones as they standout so much they are useless to thieves.
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