Hi Jane,
you're welcome, enjoy your trip when you can make it. For what it's worth in my opinion, based on experience, I should enjoy & make the best of the current situation wrt your children, while they tend to stick with you and in or near their buggy - give it another year or so and you may regret encouraging them to get out & running about... ! Plus, you'll soon be tied to the school holidays and the premium prices and crowds all that entails.
Oh the joys of parenthood...