I happened to glance out of my kitchen window a couple of weeks ago to see a sparrowhawk sitting on the lawn. I was quite shocked as I live in a large village close to a busy road. Ran off to grab the camera but by the time I got back it had flown off. I have had a family of great tits visiting the feeders every day, but when I inspected there was a little pile of blue-grey feathers.
I'm glad I didnt witness the actual kill, but at least it doesnt seem to have put the others off. The remaining four still come every day and the little ones are now feeding themselves.