Third country certificate - Vets visit

Has anyone gone through the process recently that can help?

We are about to take our cats to the vets tomorrow to get microchipped. I have the EC 998 form all ready to go and take with us. I was just looking at the DEFRA website and I can't see any information regardin this. Instead, I see what they require, to be a Third Party Certificate or Pet Passport (that looks like if you are leaving the UK though).
So now I'm confused.

Which one do I take to the vets tomorrow? Is the EC998 form still the one that is required. I'm just worried as I couldn't see it anywhere.
The page I'm looking at is here:

http://www.defra.gov.uk/wildlife-pets/pets/travel/pets/pet-owners/documentation/

Thank you in advance!

This meant to go on the Pets board....How do I move it?!

It's this. They replaced the EC 998 with it at the start of last year.

It's this. They replaced the EC 998 with it at the start of last year.

Thank you!!!!!