Here is the moment Windsor Castle discovered that Her Majesty Queen Elizabeth II had passed away.

The Head of State died in the afternoon of Thursday, September 8 with the news official being confirmed at 6.30pm.

READ MORE: LIVE UPDATES: Queen Elizabeth II passes away aged 96 - reaction from across Bucks

Captured by digital content editor Isabella Perrin who was outside Windsor Castle, onlookers saw the castle draw its flag to half mast into honour the late Queen Elizabeth II.

To read more about the tributes that were left for the 96-year-old, click here to visit our live blog.