Marco,
just found it in the AIP sect 3.4.3 para 2.3. It is actually meant as a common departure frequency for use at non radio helicopter landing sites and the official call prefix is DEPCOM. I'll be suprised if anyone actually uses it. It's the same frequency as the old Gt Yarmouth company one and I can't recall ever hearing anyone on it, mind you I think it had only just been announced then (1995).
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Another day in paradise