Bringing the cat!

Hi!
I’m researching a move to the BVI and am stuck on “cat-gate” lol!
Ideally I’d like to being her with me, but would like to know if anyone has an experience of bringing their cats over from the uk!

How much are things like cat little, cat food etc?

Also returning to the uk with the cat, would that involve quarantine?!
The possible job is only temporary for 9 months but could be extended.

Your help would be appreciated!