It's been 12 weeks since my submission

However, just today I received a letter from UKBA and unfortunately my wife's passport was lost in their department

I am thinking to send the photocopy of the lost passport and to request UKBA to approve our application, as they have all supporting documents and I have been awaiting for quite lengthy time. They could first stamp my own passport and then will do my wife's once we have it replaced.
Please tell me your thought. Highly appreciate it !!!