We flew from Dallas to Heathrow but since your cat will also be in cargo ,I assume the procedure will be the same.I had to drop my cats off at the cargo office 4 hours before the flight.
I already had the doors on their crates ziptied to make sure the door can not open accidentally.Your crate should have holes ,above and below, the door for this.The smaller crates may not. My husband drilled holes in two of our carriers.
You should also have one of those stickers that says "live animal"
I also attached a clear pencil pouch with good old zipties ,with copies of the cats papers and a baggie of food.Did not feed them food after midnight the night before. (one still pooped) ugh.
And lastly (I hope) I taped a picture of my cats on the crate,with their name and a little info.
(I can't seem to attach a picture on here)
so for example ,one said "I'm Cavuto, I'm very friendly but I hate to be picked up"
One said "I'm Monkey, I'm scared of everyone and everything."
I used lolcats.com to put text right ON the pictures.
They WILL be removing them from the crate at animal reception at Heathrow.They'll clean them up if they made a mess ,check their paper work ,read their chip and do a little health check, then hopefully say "here's your cat ma'am."
I'm going through this fun again myself on the 16th :\\\'(
It's sooo nerve wracking,isn't it?
Good luck to you and your kitty.