For more than 60 years, the National Trust's Neptune campaign has helped protect Cornwall's spectacular coastline. Martin Hesp looks at how it began, what it has achieved and the growing challenge of caring for beaches, cliffs, wildlife and the South West Coast Path.

After exploring Cornwall for more than 50 years, I've discovered secret coves, dramatic cliffs, picturesque harbours and unforgettable coastal walks. This is a personal journey around one of Britain's most spectacular coastlines.