For anyone flying on Icelandair from London - here is a heads up on printing your boarding passes.

You can check in 22 hours ahead of time (not the usual 24.) So if you're on the 1 PM flight you can check in after 10 AM eastern the day before.

Go to the Icelandair UK web site - the US site does not allow online check in.

Enter your confirmation number. For 2 people in a record enter one last name, then click add and enter the second last name, even if the same, and continue from there to pick or change your seats and print your passes.