Try the Post office policy - but you need to be sure that it will cover you worldwide. I doubt you will get anything quite so specific as flying to another country, they are more likely to fly you home by air ambulance if anything as drastic as that happens. I think it's very unlikely that any standard travel policy will just cover sickness - most people are interested in cover if your flight is delayed or if you lose your baggage or money while you're away. You might need to go to a specialist broker. Why don't you want the general cover? - to me that's just as important.