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Liverpool 1 focused on Detective Constable Isobel De Pauli (Samantha Janus), a successful Metropolitan Police detective. Her partner's career move to Liverpool in turn sees De Pauli transferred there. Upon arrival she is partnered with introverted DC Mark Callaghan (Mark Womack), a no-nonsense officer brought up on the streets of the city he now polices; the opening sequence of the first episode culminates in Callaghan throwing a suspect from an apartment window. The earlier episodes centre around the dual themes of the personality clash between De Pauli and Callaghan, coupled with the ongoing saga of the squad's pursuit of local gangster John Sullivan (played by Paul Usher). Callaghan's relationship with Sullivan - who is his cousin - and the interconnectedness of the city, are themes throughout the series.
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Network: ITV1

Mark Womack
as DC Mark Callaghan

Samantha Womack
as DC Isobel de Pauli

Tom Georgeson
as DI Howard Jones

Paul Broughton
as DC Frank White

Katy Carmichael
as DC Jo McMullan

Eamon Boland
as Chief Inspector Graham Hill

Gillian Kearney
as Julie Callaghan

Paul Usher
as John Sullivan
Scot Williams
as Patrick Callaghan

Andrew Lancel
as Ian Callaghan
Liverpool 1 has 2 seasons totalling 0 episodes, and the series has concluded.
The main cast of Liverpool 1 includes Mark Womack (DC Mark Callaghan), Samantha Womack (DC Isobel de Pauli), Tom Georgeson (DI Howard Jones), Paul Broughton (DC Frank White), Katy Carmichael (DC Jo McMullan).