You believe Mr X, who is not a party to proceedings, has a document which would help you in your proceedings and he will not agree to give you the document when you asked nicely.You would be best advised to:

Select one:

a.

Seek an order for discovery of the document in question.

b.

Serve Mr X with a Notice to Admit possession of the document.

c.

Seek permission for the court to issue a subpoena for Mr X to give evidence.

d.

Seek permission for the court to issue a subpoena for Mr X to produce the document in question.