This cracking Grey Wagtail was feeding on the sewage tanks at Stewartby, it would feed on the tops of the tanks and hop up onto the treatment pipes as they came round then either hop off the other side until the next one approached or just ride it out for a while. Also feeding over the tanks were 30+ Swallows and a few Sand martins, great sight to see them back, and a couple of them were really quite dark reddish on the breast, it was a shame the mists didn't lift so as to grab some shots. Along with a few Chiffchaff singing i also heard my first Willow warbler of the year.