I was away in Norfolk when a huge movement of Swifts occurred at the sewerage works. There are just a few times each year when sometimes thousands of birds congregate around the filter beds and even then only very occasionally when this coincides with safe access and calm drizzly conditions is it possible to make a catch. This past week afforded a couple of chances but only for a brief time. We manged to ring 29 House Martins 5 Swallows and 2 Swifts. All were healthy weights and apart for multiple flat flies on most individuals they all looked in good health too. As soon as the drizzle clears the birds fly higher and that's it.