have a look at moneysupermarket.com as you can compare quotes from different companies all in one go
I got a very good deal on family, annual, worldwide last year. Think it was flexicover direct I used in the end - even included trips to UK if accommodation is booked in advance. It's often worthwhile to consider annual insurance if you are going to make more than one trip a year.
of course I didn't think to include winter sports back then (which was only ~£10 each more) so then had to buy a week's separate cover for skiing the other week
