Relocating a pet dog from Australia to UK

Hey everyone, my brother just moved to the UK on Skilled Worker Visa. He has a pet Labrador who is currently staying with a friend in Australia. On 14th April 2023, the dog was microchipped and also got his Rabbies Vaccination. Now the rules state that the dog needs to be Microchipped, Rabbies vaccinated and Tapeworm treated before he can travel to the UK. One has to wait 21 days after the Rabbies vaccination to organise the travel for the dog. But because the dog did not travel within the 5 day limit as explained in the following rule.

Pet dogs cats and ferrets are commercial imports if they’re brought to Great Britain for:

* rehoming
* sale
transfer of ownership (including rescue cats and dogs brought to Great Britain to be rehomed)
Dogs, cats and ferrets brought to Great Britain as your own pets (they’ll live with you and will not be rehomed, sold or change ownership) are also commercial imports if:

* you’re bringing in more than 5 animals
* you cannot travel to accompany your pets 5 days before or after they arrive in Great Britain
Commercial imports of pet dogs, cats and ferrets must come from approved EU and non-EU countries.

You must follow Balai rules in this guidance and the following pet travel rules for commercial imports of pet cats, dogs and ferrets:

* microchipping
* rabies vaccination
* tapeworm treatment for dogs
Dogs, cats and ferrets that do not meet pet travel rules must be quarantined when they arrive in Great Britain.

I am unsure what Balai rules will apply in my case. Any help with this will be greatly appreciated. Thanks