Soon after, she began focusing upon script writing and one of her first screenplays was a feature film adaptation of Elizabeth Smart's poem By Grand Central Station I Sat Down and Wept.
[1] In the early 1990s, she found success with an adaptation of Ann Oakley's 1989 book The Men's Room starring Dame Harriet Walter, detailing sexual impulses in the workplace.
She continued to specialise in adaptations, writing the screenplays for Gillian Wright's The Rich Deceiver in 1995, Peter James' The Alchemists in 1999 and Agatha Christie's Sparkling Cyanide in 2003.
[1] In the mid-2000s Lamson moved into the field of television documentaries, writing Nuremberg: Nazis on Trial, Wren: the Man Who Built Britain, Gertrude Jekyll, Asylum Wars, Against All Odds, and Michelangelo.
She was diagnosed with cancer in 2007, and resolved to reconnect with her U.S. homeland, setting off on a road trip with close friend Ashtar Alkhirsan.