In addition to the falcon, I also added Little Gull to the "year list", with a first summer bird that flew overhead, along with several Mediterranean and Black-headed Gulls. Other birds seen on the heath were: Linnet, Goldfinch, Dartford Warbler, Green Woodpecker, Stonechat and several Whitethroats, including 1 carrying food to a nest.
Whilst looking for the falcon, I also heard a booming Bittern, pinging Bearded Tits and a calling Cuckoo. A Little Owl was seen on the drive.
Year List update:
165 - Red-footed Falcon
166 - Little Gull