57.10.—(1) If a party has reasonable grounds for believing that the disclosure of any evidence in compliance with rule 57.9 might lead to the intimidation, or attempted intimidation, of any person on whose evidence he intends to rely in the proceedings, or otherwise to the course of justice being interfered with, he shall not be obliged to comply with those requirements in relation to that evidence, unless the Crown Court orders otherwise.
(2) Where, in accordance with paragraph (1), a party considers that he is not obliged to comply with the requirements imposed by rule 57.9 with regard to any evidence in relation to any other party, he must serve notice in writing on that party stating—
(a)that the evidence is being withheld; and
(b)the reasons for withholding the evidence.