This has been discussed before but I'm not able to find the relevant posts but the consensus seems to be that no-one knows what it is [:w]
My congratulations on receiving your renewal pack. I have been waiting 2 months for mine. I called before Christmas and the suggestion was that the pack had been returned as undeliverable. [:0] I'm at the same address as I have been for the last 30+ years and there never has been a problem before. There was a promise to resend but I'm still waiting [V]
Yes this was referenced as far back as August, I don't think anyone knows the significance of the numerics and I have asked FC staff too with the same response!
There's a plane at JFK, to fly you back from far away all those dark and frantic transatlantic miles