If you can get a bank account with the royal bank of scotland a royalties gold account you can get holiday cover free for you and your family for 90days to the USA the cover is good.
You would need to confirm for anyone looking into this if you have to be a perm UK resident or have citizenship, I know a few people who have this account and they find the insurance very good as it is free, just get a few bills paid through the account to keep it active.