In 2018 this Durham Bird Club survey generated more than 120 forms, while separate studies in the Houghton-le-Spring area produced much more detailed data for 10-km square NZ34.
In January 2019 a summary of results for NZ34, covering the years 2016 to 2018, was posted on <a href=”https://pbs.twimg.com/media/DyFjJlfUUAEznJY.jpg”>Twitter</a>
This information can be combined with a preliminary map of the data for 2018 as submitted via the DBC forms
Durham Ornithology 
