What had happened to al the birds in my Garden in Shropshire

I am very concerned as every bird other than pigeons and crows have disappeared. I have always fed the birds on a daily basis. My garden was a delight with a variety of birds. Including  Pheasant, blackbirds, blue tits, coal tits, bullfinch, green finch, robins, Thrush etc. But, all of a sudden now for over a full month, there has been no birds anywhere about. I filled my seeders up end of July and they have remained full. Normally, we see dozens of pheasant in the fields and squashed on the road. The birdsong has disappeared. I have been asking everyone if they have seen any wild birds and everyone has also realised that I have spoken to that I am right. Something is very wrong , do you know why they have disappeared?