Hi thanks for replies, I was very tired late at night and got bogged down
reading detailed misc googled links that were not providing the answers required.

The US state coroners office recommended their 'first call' local funeral home
which for convenience we entrusted to take care of all cremation arangements.
This funeral home has quoted a shipping price to UK, plus additional cost per Death Cert.

My Family is not well off, and just needs to make sure we budget
for any sneaky hidden charges that may be imposed
once the Urn passes through a UK airport
on route to our family home.

Unwell people with chronic illness really should think twice before they embark on the holiday of a lifetime.
Or at least make sure they take out adequate travel insurance.
Especially if they never had the sense and consideration to make their immediate family
aware of any existing provisions for Life insurance.

Our relative wasn't the most responsible and prepared traveller.
All we can find are expired policies.
But she was always very conscientious regarding cat insurance.