I agree with the luggage tags (Georg Jensen do beautiful, classy tags) or maybe a travel pack with practical things - UK adaptor, padlock for luggage, a pocket-sized photo of the two of you (and/or your DD), a funky toiletry bag for the plane with mini toothbrush and toothpaste, little deodorant, tic tacs, etc. All the stuff you need on a 19+ hour flight!!