Small bird of prey idenfication

Hello. I have just seen a small bird of prey hovering (with wings still beating quite powerfully) VERY high above the fields next to my house. I am familiar with Kestrels having watched them for the past 3 years locally and something about this bird was different. Having tried to identify it, the shape of it was much like a Merlin, but the information I found said nothing of them hovering in such a way. It then flew lower before diving almost vertically and quite spectacularly down to the ground and out of sight . I am hoping someone may have an idea of what it could be?