Never-before-seen Royal Family home movies show King Charles as a toddler

Incredible unseen footage showing King Charles III as an adorable toddler has emerged ahead of the Coronation.

A very young King is seen trying to call his mother, the late Queen Elizabeth II, as she partakes in an overseas tour. 

Further never-before-seen footage shows the King as a young Prince of Wales, deflating a pressure diving suit after taking a dip in icy arctic waters.

The archival footage has come out in a new documentary, Charles R: The Making of a Monarch, being released by the BBC this weekend ahead of the Coronation.

The momentous documentary charts Charles' life and is 'narrated' by the King himself, using snippets from previous speeches and interviews. 

In the adorable home video, a very young King is seen trying to call his mother, the late Queen Elizabeth II, as she partakes in an overseas tour

Sweet black and white footage shows the King as a toddler, wandering around and cooing.

He can be seen plucking up a telephone and playing with it in the adorable home video.

'Having to do all the tours abroad, I remember, and I was quite young, trying to talk on the telephone when she was miles away,' he reminisces as the footage plays.

More unseen film includes a hilarious scene in which the then-Prince deflates a puffed-up diving pressure suit. 

He emerges from an igloo-style tent in the bright red suit and a hat to the amusement of his friends.

He then whips off the hat and remarks amid the snowy conditions 'bloody cold!'. 

The King then chuckles and lets the air out of the suit, pretending to deflate along with it before bowing for his chuckling audience.

After taking an icy dip under arctic ice at Resolute Bay, Canada, in 1975, the King can be seen emerging and playfully showing off his diving suit.

Prince Charles at Clarence House, 1950, being read to by his mother

Charles as a young boy during a family holiday at Balmoral in 1957

A young Charles aboard HMS Britannia. The new BBC documentary charts the life of the new King, who spent seven decades as heir to the throne

Charles R: The Making of a Monarch airs on Sunday on BBC One at 8pm

His voice over the tape of his intrepid dive can be heard saying 'I like to see if I can challenge myself to do something which is potentially hazardous.

'Just to see whether, mentally, I can accept that challenge and carry it out.'

All of the clips can be seen in the forthcoming sixty-minute BBC documentary, released to mark the Coronation on May 6.

The show will tell the story of King Charles III's more than seven decades as heir to the throne. 

Charles R: The Making of a Monarch airs on Sunday on BBC One at 8pm.