Gillian Anderson and Jason Isaacs look exhausted while filming scenes for new movie The Salt Path

Gillian Anderson and Jason Isaacs have been seen filming their new movie The Salt Path at Holywell Bay in Cornwall on Monday.

The Crown actress, 54, and the Harry Potter actor, 60, appeared to be fighting as they walked across the arena, before sharing a passionate kiss on set.

Both were wearing hiking gear, carrying bulky backpacks, and wearing heavy-duty walking shoes.

Gillian wore her blonde hair in a messy ponytail, while looking low-key in a blue T-shirt and biker shorts.

Jason looked casual as he donned a khaki green top and sported a full beard as he got into character.

In character: The Crown actress, 54, and the Harry Potter actor, 60, appeared to be wrestling as they walked across the arena, before sharing a passionate kiss on set

The Salt Path is the film adaptation of Raynor Winn’s novel of the same name.

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

Sadly, the couple were left homeless in their 50s after a business deal with a friend went bad and they lost the Welsh farm where they had raised their two children.

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

They decided to hike the Southwest Coast Path, living on the bare essentials with just a tent for shelter.

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

Departure: Both dressed in hiking gear, loaded with bulky backpacks, and sturdy walking shoes.

Understated: Jason looked casual as he donned a khaki green top and sported a full beard as he got into character

Casual: Gillian wore her blonde hair pulled back into a messy ponytail, while looking low-key in a blue T-shirt and cycling shorts

Struggling: Jason gave Gillian a hand as they walked across the arena

Movie: The Salt Path is the film adaptation of Raynor Winn’s novel of the same name.

Raynor decided to write an account of her story, originally intended just for her husband as a birthday present.

His novel The Salt Path was published in 2018 and soon shot to the top of the bestseller lists, selling over 1.5 million copies.

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

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.

He added: “And somehow, without our realizing it, the anguish and despair was gone too, left behind on the many headlands we had crossed.”

Cozy: Gillian was later seen in her trailer with a towel wrapped around her head and a large coat on

Work: Jason was seen chatting with crew members between shoots.

Inspirational – Tells the insightful true story of Raynor and her husband Moth, who decided to take a 630 mile walk along the Cornish, Devon and Dorset coast.

Difficult: They decided to hike the Southwest Coast Path, living on the bare essentials with just a tent for shelter

True story: 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 grown “stronger”.

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.”