A question on Whose

I can't think of any rule, but if I consider the statement Ajay369 wrote:

Receiver of Wreck is an official of the British government whose main task is to process incoming reports of shipwrecks.

Per me, whose somewhat ambiguously refers to "British government" because it makes perfect sense to associate government main task WITH processing incoming reports of shipwrecks.

La Salsa is the only Spanish restaurant in the locality whose food is palatable.
here "whose" is unambiguously referring to restaurant because food can only be from a restaurant, not locality.

I still advice to put whose near the noun it modifies- restrictive or non-restrictive.

Another scenario in which whose can be placed far:
The house that is painted red and whose windows are made of hard steel was constructed 200 years back.

This is equivalent of placing whose next to house:
"that is painted red and" can be taken out.