Hi Len
I won't say how jealous I am that you are going on holiday for 5 months :)
But in answer to your query, check with your current provider as they may be able to offer you an extended stay on your policy (this will probably be at an extra cost), failing that it would seem that you would need to take out another travel insurance policy for a long stay.
I hope you manage to sort something out and enjoy your holiday :)
thanks
maxine
Maxine
maxine.baker @ moneysupermarket.com (remove the spaces)