One star of Sky's Prisoner talks about the challenges of filming the series.

Tahar Rahim and Izuka Hoyle were handcuffed together for four months.

Tahar said being handcuffed to someone for four months could be a nightmare, but Izuka is nice.

They got on well and became friends. She's his partner. It was a pleasure.

Tahar and Izuka play prisoner Tibor Stone and officer Amber Todd.

Izuka and Tahar had to film close together because of the handcuffs.

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After an attack, Amber handcuffs herself to Tibor to keep him safe.

Tibor is a trained assassin who can fight back.

Tahar and Izuka had to do stunts together while handcuffed.

Being handcuffed made the stunts more complex.

The stunt team was brilliant and helpful.

The stars had to film stunt scenes together in handcuffs.

Izuka and Tahar had to adapt and move together.

Izuka is strong and has good instincts, making it easier.

Acting with a partner is like a dance.

Having handcuffs on made them realize how close they'd be.

Tahar is incredible and physically fit.

They pushed each other to do better.

Prisoner will be on Sky as a boxset on April 30.