Having the Rainham RSPB reserve just over the water from Crayford Marshes increases the prospects of rarities turning up on our side of the river. Bexley RSPB members visiting on December 17th were delighted they got to see a Cattle Egret, as well as a good number of Pintail, despite the foggy conditions which otherwise limited their sightings.
http://www.bexleywildlife.org/wp-content/uploads/2016/12/Bexley-RSPB-Group-Field-Outing-to-Rainham-Marshes-RSPB-Reserve-Saturday-December-17th-2016.pdf