Apologies if this causes everyone to say "Doh, obvious!", but this one is causing arguments in our home.
I'm tempted to go with peregrine falcon, its the beard like appearance at the back of the beak that makes me think the same.
BTW, Bristlebeard, you're more likely to find anyone folk here are friendly and helpful with any query, after all, we all need to ask the question from time to time, and welcome to the forum.
This was our visitor in our garden the other week.
Never seen one around this area before so was a massive shock when we looked out of the window and saw him..