Here are my two favorite photos taken so far this year. As it happens, they were taken within about an hour of each other, at the same location - Stodmarsh NNR in Kent.
I've been to Stodmarsh perhaps half a dozen times now, and every time I've been, I've seen Marsh Harriers. They are completely reliable!
What I haven't seen before though is nest building, which is what this female is up to.
Shortly afterwards, a Hobby landed in a nearby tree. I was just lining the shot up, when a cuckoo landed right next to it! Not something you see every day :-)