The survey is published jointly every year by the RSPB, the British Trust for Ornithology, the Wildfowl & Wetlands Trust, the Countryside Council for Wales, Natural England, the Northern Ireland Environment Agency, Scottish Natural Heritage and the Joint Nature Conservation Committee.

It has revealed that in the period after 1994, the number of threatened species has risen by 18%, with 45 populations declining.

There is, however, some good news. The survey, which was carried out by 3,500 volunteers, shows that the number of species in steep decline has now more than halved, and that the number increasing has risen from four to six species.

Since 1994, the bittern, corncrake and roseate tern have all been increasing and the skylark, song thrush and tree sparrow, which were declining, are currently stable, all mostly thanks to conservation efforts.

The Game & Wildlife Conservation Trust’s Dr Nicholas Aebischer said: “Fortunately, on estates that are involved in our Grey Partridge Scheme, the birds have shown an impressive 26% comeback between 2009 and 2010. The past two good summers have certainly helped, particularly as the previous two were the wettest on record. But with the right support partridges can bounce back quite quickly.”