Ditto, we only ever see "our" female too, she is a "Collared Dove" specialist. The male is a lot smaller in the Sparrow hawk, and I think he must hunt away from the gardens, my suspicion would be that it is a long the railway line (about 400m away), as the track is in a wide cutting with lots of scrub and small birds.I haven't seen a male yet but, I think once they pair up they use different feeding grounds?