It is a pleasure to serve under your chairmanship, Mr Nuttall. I am pleased to contribute to this debate because the area of Wales that my hon. Friend the Member for Newbury (Richard Benyon) spoke about, the Berwyn range, is well known to me. It is worth remembering that that range, which covers a huge area and is internationally protected because of its significant numbers of hen harriers, has been managed by the RSPB. The peer-reviewed findings of the study between 1983 and 2002 are therefore incredibly important. If the decline is down to grouse moor management, why are we not seeing an explosion of hen harrier and grouse numbers on the more than 312,000 acres of land managed by the RSPB? That is peer-reviewed scientific evidence. The hon. Member for Bristol East (Kerry McCarthy) failed to say what sources she is relying on or, indeed, whether those sources are peer-reviewed.
Between 1983 and 2002, lapwing were lost from the Berwyn survey area, golden plover declined from 10 birds to one and curlew declined by 79% despite its conservation designations. Carrion crow numbers increased sixfold and raven numbers fourfold, with the number of 1 sq km grid squares that they occupied doubling and trebling respectively. Buzzard numbers increased twofold, and the number of occupied grid squares increased fourfold. Peregrine numbers increased sevenfold, whereas hen harrier numbers declined by half. No significant changes were detected in the abundance of other SPA-designated raptors, merlin and kite.