Maybe it is to do with
Duty of Disclosure as in this link?
Disclosure in Criminal Cases | Defence-Barrister.co.uk — Defence-Barrister.co.ukThe-Defence-Statement.
I can understand that the prosecution may present evidence that may need the defence to reciprocate.
I think that must be it. Good find.
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The Defence Statement – the Defence Duty of Disclosure in Criminal Cases
A Defence Statement is mandatory in Crown Court cases and optional (but sometimes valuable) in Magistrates’ Court cases. If you are unsure if your case is one which will remain in the Magistrates’ Court or one which can go to the Crown Court have a look at
Which Court Will I Go To?
Section 6A of the CPIA provides the requirements of a Defence Statement which must be a written statement setting out:
(a) the nature of the accused’s defence, including any particular defences on which he intends to rely,
(b) the matters of fact on which he takes issue with the prosecution,
(c) in the case of each such matter, why he takes issue with the prosecution,
(d) particulars of the matters of fact on which he intends to rely for the purposes of his defence,
(e) any points of law (including any point as to the admissibility of evidence or an abuse of process) which he wishes to take, and any authority on which he intends to rely for that purpose.
(2) A defence statement that discloses an alibi must give particulars of it, including—
(a) the name, address and date of birth of any witness the accused believes is able to give evidence in support of the alibi, or as many of those details as are known to the accused when the statement is given;
(b) any information in the accused’s possession which might be of material assistance in identifying or finding any such witness in whose case any of the details mentioned in paragraph (a) are not known to the accused when the statement is given.
A Defence Statement must be served within 28 days of the prosecution providing initial disclosure (or purporting to do so) and in the Magistrates’ Court, if a decision is taken to serve a Defence Statement, this must be done within 14 days of the date when the prosecution complies with its duty of initial disclosure (or purports to do so). Within these time limits an application may be made to extend time for service.
(More at link.)