Gillian Anderson reunites with her on-screen son Asa Butterfield on set of Sex ...

She stars as sex therapist Jean Milburn in the raunchy Netflix show Sex Education.

And Gillian Anderson reunited with her on-screen son Asa Butterfield on Sunday as filming got underway for season two of the comedy at The Chalet in Symonds Yat.

The X-Files star, 50, wrapped up warm, in a lilac dressing gown as she relaxed between takes on the sprawling, countryside set.

Back to work: Gillian Anderson, 50, wrapped up warm, in a lilac dressing gown as she relaxed between takes on the sprawling, countryside set of Sex Education in Symonds Yat, Wye Valley

Back to work: Gillian Anderson, 50, wrapped up warm, in a lilac dressing gown as she relaxed between takes on the sprawling, countryside set of Sex Education in Symonds Yat, Wye Valley

The actress, who had her golden locks styled smooth around her shoulders, was spotted embracing Asa, who plays her son Otis in the drama, as he arrived in the Wye Valley.

Gillian later changed into a gorgeous green embroidered gown and a matching jade and gold jacket as she looked over her lines before filming a scene.

Ender's Game star Asa, 22, wore brown, straight leg trousers and a white and tan striped shirt, before switching his outfit for light wash jeans and his character's typical white, red and blue jacket. 

Reunited: The X-Files star reunited with her on-screen son Asa Butterfield on Sunday as filming got underway for season two of the comedy

Reunited: The X-Files star reunited with her on-screen son Asa Butterfield on Sunday as filming got underway for season two of the comedy

Thrilled: The pair, who portray mother and son Jean and Otis Milburn, grinned as they hugged on the gorgeous open set

Thrilled: The pair, who portray mother and son Jean and Otis Milburn, grinned as they hugged on the gorgeous open set

Also on set at the Norwegian-style chalet, which poses as the home of Jean and Otis in the show, were Emma Mackey and Ncuti Gatwa, who play Otis' friends Eric Effoing and Maeve Wiley.

In one snap, Ncuti, 26, was seen climbing out of a mustard yellow car in extremely colourful, patterned co-ords.

And Emma, 23, was spotted enjoying a bite to eat on set as she got in to character as the sarcastic Maeve in a black lace dress, leather jacket, and chunky ankle boots.

Waiting: The actress, who had her golden locks styled smooth around her shoulders, waited by the side of a mustard yellow car as her co-star Ncuti Gatwa sits inside

Waiting: The actress, who had her golden locks styled smooth around her shoulders, waited by the side of a mustard yellow car as her co-star Ncuti Gatwa sits inside

Ready to go: Ender's Game star Asa, 22, donned his character's typical white, red and blue jacket as he appeared as the socially awkward Otis on the set

Ready to go: Ender's Game star Asa, 22, donned his character's typical white, red and blue jacket as he appeared as the socially awkward Otis on the set

Sex Education follows Otis as he teams up with street smart Maeve to create a sex therapy clinic at their school.

Netflix announced in February that the show would be returning for a further eight episodes. 

Alongside Gillian, Asa, Emma and Ncuti, breakout stars Aimee-Lou Wood, Connor Swindells, Kedar Williams-Stirling, Tanya Reynolds and Patricia Allison are all set to reprise their roles. 

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