May 10th.
Well, several hours of looking for, and hardly seeing, Hobbies today.
Two observations: one bird perched on a pylon at distance this morning, and, bizarrely, I heard a bird, but didn't see one, this afternoon.
The former was a thousand-yard-away bird from the far end of my patch. When I had made my way to a nearer viewpoint, it had, of course, disappeared.
The latter happened as I was getting ready to return home, after an hour and a half watching the skies. The distinctive wader-like call of a territory dispute "k-lip, k-lip" from a Hobby overhead - presumably chasing a second. But I couldn't get on them, which was very frustrating.
Swifts, carefree and unmolested, skimmed flies from skies throughout.