27 Proof of statements contained in documents.E+W
Where a statement contained in a document is admissible as evidence in criminal proceedings, it may be proved—
(a)by the production of that document; or
(b)(whether or not that document is still in existence) by the production of a copy of that document, or of the material part of it,
authenticated in such manner as the court may approve; and it is immaterial for the purposes of this subsection how many removes there are between a copy and the original.