Regular readers will be familiar with ‘House Style’, in which we ask members of our community 10 pressing questions about the nuances and details of their homes. In the first of a new film series, we’re presenting a visual spin on the series with Harriet Williams, co-founder of Polish poster specialist, Projekt 26. Watch as we tour her playfully renovated 1960s house in Forest Hill, south-east London, while she highlights her favourite things at home, from a pink tongue-shaped kitchen island to 1970s fondue kit.

Harriet was working as a graphic designer when she met her Polish-born business partner, Sylwia Newman. Along with a liking for mid-century design, the duo formed a friendship over a love for a somewhat more niche topic: the Polish School of Posters, a little-known, communist-era art movement that specialised in colourful and subversive prints. With an aim to bring light to this work, they founded Projekt 26, where the duo source and sell the posters from Harriet’s home. “I have them all over the house,” she says. “More is more when it comes to posters.”

Harriet’s home is situated within Little Brownings, which forms part of the mid-century Dulwich Estate. Harriet wanted to live here so much, in fact, that she wrote to its residents in the hope that someone would be selling. While she got lucky, the house was then in somewhat a sorry state. So, she called upon the assistance of Archmongers, a Hackney-based practice with expertise in revamping modernist homes, to reimagine the house for herself, her two children and poodle, Teddy.

The sunshine-yellow front door makes a fitting entrance, for the completed project is brimming with playfulness and personality. Along with colour from the Polish posters she’s not yet ready to part with, tasteful hues of pink, green and blue subtly punctuate the white-walled interior. The house is also incredibly – or as Harriet says “secretly” – practical, with hidden contraptions and concealed rooms, which we discover on the bright spring morning of our visit.