Yes! That was the recording case that I mentioned. Nice work.
Previously, I was aware of Natunen v Finland 21022/04 31/03/2009
There, ECHR points out that it is a violation of Article 6 for the prosecution to pick out what evidence the defense may have or not have. That case also involved telephone intercepts. Excerpts:
47. Even though the police and the prosecutor were obliged by law to take into consideration both the facts for and against the suspect, a procedure whereby the investigating authority itself, even when co-operating with the prosecution, attempts to assess what may or may not be relevant to the case, cannot comply with the requirements of Article 6 § 1. Moreover, it is not clear to what extent the prosecutor was, in fact, involved in the decision to destroy those recordings which were not included in the case file. In this case, the destruction of certain material obtained through telephone surveillance made it impossible for the defence to verify its assumptions as to its relevance and to prove their correctness before the trial courts.
48. The Court finds that the present case is different from, inter alia, Fitt v. the United Kingdom [GC] (no. 29777/96, ECHR 2000‑II) and Jasper v. the United Kingdom [GC] (no. 27052/95, 16 February 2000) where the Court was satisfied that the defence were kept informed and were permitted to make submissions and participate in the decision-making process as far as possible and noted that the need for disclosure was at all times under the assessment of the trial judge, providing a further, important, safeguard. In those cases the Court found no violation under Article 6 § 1 (see Fitt, §§ 48-49, and Jasper, §§ 55-56). The Court recalls that, in this case, the decision regarding the undisclosed evidence was, presumably, made in the course of the pre-trial investigation without providing the defence with the opportunity to participate in the decision-making process.
49. In the present case the Court further notes that the contested measure stemmed from a defect in the legislation, in that it failed to offer adequate protection to the defence, rather than any misconduct of the authorities, who were obliged by law, in force at the time, to destroy the impugned recordings (see paragraph 21 above). The Court observes that in the Government Bill for the amendment of the Coercive Measures Act it was considered problematic that information supporting the innocence of the suspect could be destroyed before the resolution of the case (see paragraph 22 above). The relevant provision was amended with effect from 1 January 2004 with a view to better safeguarding the rights of the defence. This amendment, however, came too late for the applicant.
50. Having regard to the above considerations, the Court concludes that there has been a violation of Article 6 § 1 of the Convention taken together with Article 6 § 3 (b) of the Convention.