UistBTO
Member
As a result of the efforts of Heronries Census volunteers nearly 800 sites were visited in 2019, with the population estimate of 9,940 apparently occupied nests representing a slight increase on the revised 2018 estimate of 9,798 apparently occupied nests. The full summary report of the 2019 Census has just been published on the BTO website (and also includes results for Little Egret and Cormorant).
https://www.bto.org/sites/default/files/heronries-census-summary-2019.pdf
https://www.bto.org/sites/default/files/heronries-census-summary-2019.pdf