Moving to the UK with pets

Not sure if this post is allowed but I want to be prepared! I applied for a fiancé visa (US citizen), biometrics October 4th. I have 2 cats that I will be moving over with me (if visa is granted) and want to know if others have moved their pets over and what that looked like for them? I think I’m going to use IAG cargo - they’ve given me the most reasonable quote. Do I need another company sponsoring on the other side? The process is confusing so would love to know how others have done it! Thanks :)