Filming for Gillian Anderson and Jason Isaacs' new movie The Salt Path is well underway at Holywell Bay in Cornwall. 

The actress, 54, took a dip in the sea before sharing a sweet moment with the Harry Potter star, 60, on Sunday. 

Gillian could be seen wearing a long sleeved nude top and striped pyjama bottoms that had been splashed with the salt water. 

Her damp blonde hair was styled into beachy waves as Jason gave her a kiss on the head in between takes. 

Meanwhile, the actor sported a full grey beard and hair and wore a casual black T-shirt with a pair of loose fitting trousers as he got into character. 

At work: Filming for Gillian Anderson, 54, and Jason Isaacs' new movie The Salt Path is well underway at Holywell Bay in Cornwall

Cute: The actress took a dip in the sea before sharing a sweet moment with the Harry Potter star, 60, on Sunday

Gillian and Jason later wrapped up warm in fleece ponchos and enjoyed a hot drink from a flask. 

The Salt Path is the film adaptation of the best-selling novel of the same name by Raynor Winn.

It tells the profound true story of Raynor and her husband Moth, who decided to make a 630-mile trek along the Cornish, Devon and Dorset coastline.

The couple sadly became homeless in their fifties after a business deal with a friend went wrong and they lost the Welsh farm where they had brought up their two children.

Their situation was then worsened when Moth was diagnosed with corticobasal degeneration, a rare and incurable degenerative brain disease.

They decided to walk the South West Coast Path, living on bare essentials with only a tent to shelter in.

The couple soon rediscovered their happiness, while Moth's condition even improved as they made the challenging journey.

Raynor decided to write an account of their story, originally meant only for her husband as a present for his birthday.

Stunning: Gillian could be seen wearing a long sleeved nude top and striped pyjama bottoms that had been splashed with the salt water

Filming: Meanwhile, the actor sported a full grey beard and hair and wore a casual black T-shirt with a pair of loose fitting trousers as he got into character 

Taking a break: Gillian and Jason later wrapped up warm in fleece ponchos and enjoyed a hot drink from a flask

All smilies: Her damp blonde hair was styled into beachy waves

Tough: Gillian was seen struggling with their tent during the scenes 

Her novel The Salt Path was published in 2018 and soon skyrocketed to the top of the bestseller lists and sold more than 1.5 million copies.

It would go on to be shortlisted for the Costa Book Awards and the Wainwright Prize, and won the inaugural RSL Christopher Bland Prize.

Writing for The Mail On Sunday earlier this year , Raynor said their journey on The Salt Path had left them feeling more connected to nature.

She added: 'And somehow, without us noticing, the anguish and despair had gone too, left behind on the many headlands we’d crossed.'

Coming soon: The Salt Path is the film adaptation of the best-selling novel of the same name by Raynor Winn

Inspiring: It tells the profound true story of Raynor and her husband Moth, who decided to make a 630-mile trek along the Cornish, Devon and Dorset coastline (pictured in December)

Awful: The couple sadly became homeless in their fifties after a business deal with a friend went wrong and they lost the Welsh farm where they had brought up their two children

Events: Their situation was then worsened when Moth was diagnosed with corticobasal degeneration, a rare and incurable degenerative brain disease

Life story: They decided to walk the South West Coast Path, living on bare essentials with only a tent to shelter in

Stronger: The couple soon rediscovered their happiness, while Moth's condition even improved as they made the challenging journey

She wrote that she and Moth had not only 'survived' their homeless experience, but had become 'stronger for it'.

Raynor continued: 'We all have the ability to change and embrace a new future. We just have to act.'

The film adaptation stars Gillian and Jason as Raynor and Moth and will be directed by Marianne Elliott.

Gillian tweeted that she 'couldn't wait to get started' on the project, calling the novel an 'amazing book'.

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