Life assurance policy documents

Trustees of an estate, who are also trustees of a life assurance policy in trust,
I have asked the trustees for the documents for the claimed life assurance policy, that they sent to the life company, and also asked the life assurance company to do the same.
Trustees solicitors say, its confidential, and the life assurance company say, i need permission from the trustees.
What is the best route i should follow, for the disclosure of documents, should i go direct to the courts, and how do i do this… its a fraud case, self appointment and retirement of original trustees, original trustees declared that they never knew they were trustees.
1 is a solicitor, the other, an accountant