AFAIK the Avior doesn't come with a pad in the bottom - mine didn't. However, an offcut of carpet or a piece of vet bed works a treat.
The stroking hatch is lovely to use, but I have to be really careful where and when I use it as Pearl can squeeze through the hole!!!
OT, a Purrs sticker / badge to download and print off would be lovely. It allows those of us who show with the GCCF to be identified by other Purrs members at shows without breaking rules as we're not allowed to advertise our presence or our cats' presence at shows in the public domain.