What am I forgetting?

The hours are ticking down before we leave for England on the first leg of our trip. There are a couple of reservations that need to be made and of course the packing hasn't even begun yet but one way or another the time will come to get on the airplane and venture off across the pond.
The list at work of items that are incomplete is getting smaller and smaller and yet there is a nagging feeling that I'm forgetting something rather important. So if you know what that might be you have about 48 hours to let me know before there won't be anything that I can do about it.