How much did you save (dual citizen US/UK)

Hello! I’ve been wanting to move to the uk for a while now and I believe it’s finally time to start planning it seriously now that my wife is on board. I am a 100% disabled veteran and will have guaranteed income. I also have two other sources of income and currently make around 90k a year.

We are a family of 4 with two dogs and one cat. My wife and children will need visas I know.

How much should we aim to save up prior to moving ?

Also if any other us vets are here. How do you use your medical benefits and so on?