ADT Home Security Starter Kit F-ADT-STR-KT-1 work in any country?

No. It requires a special model hub. The model number you listed is specific to the US.

They had originally said that they would be releasing a UK version, but they ended up rolling out their Vodafone partnership instead.

The following discussion thread has more details:

ADT/SmartThings Hub Announced for UK in November 2018

The page on the SmartThings UK site which announced the coming ADT product has been removed from the site.

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