Other then this, routine migrants were seen plus a couple of large raptors that made the most of the northerly wind.
Yellow Wagtail - 1 flew past Harry's Bush and landed briefly in Lower Cuckmere
Firecrest - 2
Goldcrest - 8
Chiffchaff - 6
Red Kite - 1 N at 10am
Marsh Harrier - 1 fem N at 10.40am
Yellowhammer - 1
Wheatear - 1
Rook - 2 observed flying in off
Unfortunately the very poor pictures here only shows an extremely bright adult Yellow Wagtail with the hint of a cloudy blue head and distinct but flared supercilium. On the camera there is a slight hint of a pale ocular patch but is nowhere distinct, so for me difficult to determine whether its a Blue-headed Wagtail, or a Channel Wagtail.
If the bird was a Blue-headed I would've thought the head to be a darker blue, wingbars to be more distinct and the supercilium to be equal in depth, so I'm more turning towards 'Channel Wagtail' for these reasons.
An attempt to get closer resulted in not seeing the bird again, presumably having flown off in the process of Bob and myself climbing through the barbed-wire fence.
Red Kite north over Seaford Head
Yellowhammer - an uncommon sighting on the headland
later in the morning, a stop round mum and dads produced another Red Kite for the morning