His debut work was the audio play The Rapture for Big Finish Productions in 2002. Numerous further audio plays and prose short stories followed for Big Finish, for their Doctor Who line, spin-offs and other series (Sapphire & Steel and The Tomorrow People).

In 2005, he started working for the BBC, doing miscellaneous writing work for tie-in materials for the new Doctor Who television series. It was announced on 16 July 2007 that he would be one of the writers on the second series of Doctor Who spin-off Torchwood, his television debut.

In 2010, Lidster wrote the content for several tie-in websites relating to the fictional world of the new television series, Sherlock.

Television

• Torchwood
• "A Day in the Death" (2008)
• The Sarah Jane Adventures
• The Mark of the Berserker (2 parts, 2008)
• The Mad Woman in the Attic (2 parts, 2009)
• The Nightmare Man (2 parts, 2010)

Radio

• The Afternoon Play
• Torchwood: Lost Souls (2008)

Audio dramas

• Doctor Who
• The Rapture (2002)
• Master (2003)
• Terror Firma (2005)
• The Reaping (2006)
• The Gathering (2006)
• 100 (2007)
• Sapphire and Steel
• Daisy Chain (2005)
• The Mystery of the Missing Hour (2007)
• UNIT
• The Longest Night (2005)
• Bernice Summerfield
• The Crystal of Cantus (2006)
• The Final Amendment (2007)
• The Tomorrow People
• Aftermath (2006)
• Dark Shadows
• London's Burning (2010)

Short stories

• Doctor Who
• I Was A Monster!!! in Zodiac (2002)
• That Time I Nearly Destroyed The World Whilst Looking For a Dress in Past Tense (2004)
• The Tramp's Story in Repercussions (2004)
• Trapped! in Monsters (2004)
• The Terror of the Darkness in A Day in the Life (2005)
• She Won't Be Home in The History of Christmas (2005)
• Curtain Call in Farewells (2006)
• Prologue and Forgotten in The Centenarian (2006)
• Natalie's Diary in Dalek Empire (2006)
• Salva Mea in Snapshots (2007)
• Keeping It Real in The Ghosts of Christmas (2007)
• Prologue for the BBC's Doctor Who website (2007)
• Bernice Summerfield
• A Summer Affair in A Life Worth Living (2005)
• Dead Mice in Something Changed (2006)
• Torchwood
• Monster in the Torchwood Yearbook (2008)
• Consequences (2009)

Novellas

• Bernice Summerfield
• On Trial in A Life In Pieces (2004)

Audiobooks

• Torchwood
• In the Shadows (2009)

Other

From 2005 onwards, he wrote the fictional content for the Doctor Who tie-in websites including the MySpace blog for Martha Jones. In 2007, he edited the Doctor Who short story collection [[Short Trips