We've had great visibility lately in clean Atlantic air. Scilly has been sharp from 30 miles away, but these photos of west Cornwall (by Robin Mawer) from Scilly are remarkable.
Lands End is 28 miles from Scilly, Longships Lighthouse is nearer 25miles. Love the way only the very top of the lighthouse shows, Flat Earth members please note.
Sennen Church is roughly 30 miles from St. Mary's.
Visibility has been >50 miles recently.
Graham
Penzance - Glorious sunny, warm day.