Accompanied the walk in dreary weather as a volunteer. Using ISO 3200 on the Olympus, I was still only at 1/1000th sec. I spotted goldcrest and tree creeper and photographed a swallow spotted by our leader. When I downloaded the images, I spotted a ? sand martin we hadn't seen at the time on the same tree as the swallow. Finally a dunnock. We ticked 45 species, and saw none of the usual raptors.