Buzzards and Red Kites are both increasing in number in UK which is a good thing, except for the increased collision risk for light aircraft.
My one bird strike was a black headed gull which came through the prop of the chippy but missed the canopy and did no damage, thankfully. I did have a near miss with a thermalling buzzard once, and the scary thing is it came up from below so wasn't in my sight until the last second or so. It appeared in my 10-o'clock from below, and flashed over the canopy top making me duck involuntarily!
Interesting to find lots of swallows and martins at about 6,000 feet during aerobatics once! They must have thermalled up there following the insects they feed on, which had been carried aloft in the thermals.