In your question you state plant by which I assume you mean Equipment.
You don't say if your concerns extend to the Contractor not performing on site progressing the works.
I suggest that if the Contractor is not performing you notify an early warning and have an open discussion.
You don't say if your concerns extend to the Contractor not performing on site progressing the works.
I suggest that if the Contractor is not performing you notify an early warning and have an open discussion.