The Truly, Madly, Deeply star, who plays humanitarian icon Mother Teresa in new movie The Letters, felt compelled to do something for the desperate souls living in camps in France after learning just how bad their living conditions are.

"There's a big refugee camp in Calais with people trying to get into the U.K. and to get across the channel into England and they're not allowed to, so they're camped in this refugee camp, which is getting bigger and bigger," she tells WENN. "People are living in tents and it's very cold and wet and muddy now. There are no facilities; no running water, no hot water, no toilets; it's tough.

"People have responded generously and given lots of clothing and bedding and tents, but there's no infrastructure to sort all that out. So my husband and I are going to drive a carload of stuff to Calais to the camps this weekend.

"It's quite chaotic and not getting there so we thought, 'Let's just do it ourselves'. I made contact with two people in the camp. I want to go and see it, how people are living in Calais in this weather; it's muddy and cold. We hear a lot about this stuff but we don't really know, so I'd quite like to get more involved once I finish work. It's always interesting to see the world behind the news headlines."

Stevenson, who works with refugee families in London, admits she's often more than a little upset to learn of the poor treatment people arriving in the U.K. experience from her native Brits, adding, "The refugees who have come to our country and the incredible bravery of what they survived; I can't imagine getting through it myself.

"There are people in my country who say, 'It wasn't what happened to me in my first country, that I fled from, that broke me; it was what happened when I got to Britain that broke me'. It breaks my heart to hear that because I think my country is treating people so badly."

But the actress is hoping to bring a little Christmas cheer to one refugee community in London by helping to save their community centre in Islington.

"It has been around for a while, 20 years or so, but it's lost all its funding," she explains. "It's in a lovely church where refugees and asylum seekers can come and get hot food and tea and clothing that's been donated. They are taught English, writing, art workshops and are helped sorting out paperwork; all for free of course.

"It's a community for many of them to belong to who have no community. They are not allowed to work by the government so they are very isolated. It was going to have to close so I and a couple of other people started an appeal to raise $50,000 by Christmas. We're not far off that target, which is really great."