You could try age concern, my husband is only 65 but suffers from a variety of ailments, angina, 2 dvts not to mention the amputation of his left leg. We are cruising through panama canal and flying into usa to pick up the ship. Every other company wanted nearly £1800 for just the one trip. Age concern have offered us insurance less than £400 but our excess is £500 and this is for a years insurance. Hope this is of assistance.