Dartford warblers on the Dorset oilfields

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When working as a librarian in a scientific research station for the gas industry, I was used to obscure demands for information. Among these were regular requests from the biologists about wildlife, flora and fauna on the Dorset oilfields. The Dartford warbler (Country diary, 30 June) was largely conserved due to the diligence of our scientists, anxious to ensure the drilling did not have an adverse effect on the natural habitat.
Susan Baillie
Weymouth, Dorset 

Cover photo:  A male Dartford warbler beside Poole Harbour, Dorset. Photograph: Dom Greves/Alamy