I would have loved to but away at work.
As for raptor predation, well yes it can be a problem, Sparrowhawks keep knocking off the wild grey partridge in late winter.
But there is only one real factor in declining farmland birds and that is modern farming practices, in my locality it is all arable and almost no over wintered stubbles, a lot farmers even when growing a spring crop want their land under the plough all winter, especially as so many use contractors they might as well get the land worked whilst prepping for the autumn crops.
Shooting can be a great help for wild birds, but it is not all rosey, for example game crops are fantastic for the tweety birds if they are the right type, and last long enough, which is most game crops except maize, and unfortunately most big shoots prefer pure maize covers to anything else. The only thing maize is good for is game and vermin. Then there is the habit of topping game crops on feb 2nd, just in time for the hungriest months of the year. Referring back the grey partridge getting killed off by the sprawks, there is just no cover for them to hide away in on so many arable farms once winter kicks in and / or when the game strips get chopped.
Then there is the massive amounts of rats that game crops (esp. Maize) harbour but so many shoots seem to care little about. Those same rats which go on to infest the hedgerows will be hunting out and chomping down on any ground nesting birds eggs and chicks just as much as any carrion crow, stoat or weasel...