Insurable Interest & loss due to delay

X is a Real Estate Development company that has taken an insurance policy from Y insurers for the redevelopment of a building. During the redevelopment, there was a fire and the buildings architectural plans along with a substantial amount of building material were destroyed. Due to the destruction of the architectural plans the redevelopment of the building got delayed from 6 months to 1.5 years. The insurers claim that the loss from delay is not covered under the policy as the developer has no insurable interest in the architectural plans. The case is now in appeal.What are the relevant issues for both X and Y insurers and examine the issue ofninsurable interest in detail.