Four women have been selected from 6,000 candidates to run the world's most remote post office and count penguins in Antarctica. Clare Ballantyne, Mairi Hilton, Natalie Corbett and Lucy Bruzzone will travel 9,000 miles from the UK to manage the historic site of Port Lockroy, on Goudier Island. They will spend five months without electricity, running water or flushing toilet.