William Lindesay has been obsessed with the Great Wall of China since seeing it in a school atlas as a child in England， and last year embarked on an epic journey to fulfil a lifelong ambition - to film the wall in its entirety from the air. He told the BBC’s Anna Jones about this quest.
"The Great Wall is an amazing sight， and it deserves to be seen in its best light，" says William from his home in Beijing.
Unable to shake his childhood fascination， he moved to China from Wallasey on Merseyside in 1986 "for the wall"， and has since researched it extensively， writing several books and gaining an OBE for his work.
The wall most tourists see today is in places like Badaling， an easy day trip from Beijing， where the stones and towers have been repeatedly restored.
"But there’s more to the wall than that，" says William， who trained as a geographer. "Before the tourist wall that people flock to， there were many other ’Great Walls of China’."