The phrase "the only instance where" is correct and commonly used in written English.
It is typically used to refer to a particular situation or event that is the sole occurrence of something. It can be used to emphasize the uniqueness or rarity of a situation. Example: This is the only instance where I have seen a kangaroo in the wild.
Nor is this the only instance where Sontag plays with imagery that is startlingly familiar.
He told Guardian Australia: "This is not the only instance where data which has been seen as controversial or just difficult to understand has been buried".
This is not the only instance where the Tory party has shown its willingness to engage in racialised nods and winks to win votes.
This conflict is the only instance where both parties actively court the U.S. for support and perceive the U.S. to be an ally.
Of all the profligate pissing away of public money that goes on in this country, the only instance where the public are actually going to get their money back seems an odd target for your ire.
The violence that ensues is hard to stomach, but it provides Vincent-N-Roxxy with a desperately needed jolt, marking the only instance where Schultz, who has a background in horror having directed Devil in my Ride, seems in full command of his craft.
Her communications with Mr. Leonard were the only instances where she could speak freely without risking prosecution.
SM: The only instances where it may make sense for us to develop our own product is if we see demand for something that we can't get through a brand.
The only instances where this type of mindset became somewhat apparent occurred during Teachers A and D's classroom instruction, when they both used a teacher-led card-sorting demonstration to facilitate explaining the origin of variation.
Both of those times are the only instances where I accidentally drugged myself, but that's not the goal of these conventions. .
While the legal challenge focuses on people accused of fraud and misrepresentation, these are not the only instances where the government can automatically take away a person's citizenship.
