Barrett subsequently lived in
Pembrokeshire for 50 years. In 1947 he became the first Warden of
Dale Fort Field Centre, established as a centre for the study of marine biology, but which also included the Skokholm Bird Observatory on the island of
Skokholm. He was appointed Minister's Nominee to the fledgling
Pembrokeshire Coast National Park, initiated a series of guided walks, fought for the establishment of a coastal path (he wrote the
HMSO guide to the path), and served on the Park Committee for twenty-five years. He established the Pembrokeshire Countryside Unit in
Broad Haven in 1968. When leading walks along the coastal footpath he was accompanied by a dog called "dog". ==Books==