Supposing the possible son of Nicholas Glyn, who is probably still alive, is the owner of the bear, I've looked on 192.com and he doesn't seem to be on the site. I don't have a subscription though so cannot be sure.
If the bear was found in the departure lounge maybe the descendant of Nicholas was emigrating and on finding the bear was missing had no idea how to trace him and is now unaware of all the attention the bear is attracting. Hence why he hasn't come forward.
I know all of that is pure speculation but there has to be an explanation. So, if Bristol Airport are going to contact in the morning how are they then going to find the person who is descended from Nicholas because a year is a long time in terms of someone's address.