Walked the railway down and back. First birds of note were a pair of Goosanders upstream from Fremington Quay. Shortly after, started to scan Saltpill Pond, when the Teal got agitated and several Snipe took flight. Looked up to see a juv/f Hen Harrier passing over, heading W. Continued, hoping it would be hunting Home Farm Marsh. Instead, first bird seen was a female Marsh Harrier, quartering the field in front of the viewing screens. First two-Harrier day for a long time. On the way back, saw one Ibis in Fremington Creek, but no Spot. Red. On Penhill Marsh were 250+ Brents, and on the sandbanks beyond 400+ Golden Plovers.