Thandie Newton puts on an elegant display in monochrome midi dress as she attends BFI & Radio Times TV Festival in London

She's currently starring as DCI Roz Huntley in BBC drama Line Of Duty.

But Thandie Newton put her police uniform away as she attended the BFI & Radio Times TV Festival in London on Saturday.

The 44-year-old actress put on an elegant display in a black and white midi dress as she arrived at the event at the Southbank.

Sophisticated: Thandie Newton put on an elegant display in a black and white midi dress as she attended the BFI & Radio Times TV Festival in London on Saturday

Sophisticated: Thandie Newton put on an elegant display in a black and white midi dress as she attended the BFI & Radio Times TV Festival in London on Saturday

With its puffball sleeves and a bold monochrome design, the unusual gown showed off her slender frame, with the hemline finishing just above the ankles.

Keeping her accessories minimal, Thandie complemented the sophisticated number with a pair of strappy black heels, before adding pearl drop earrings.

Wearing her long tresses tied off her face in a high pony tail, she accentuated her flawless complexion with a dash of blusher. 

Glam: Wearing her long tresses tied off her face in a high pony tail, she accentuated her flawless complexion with a dash of blusher, before adding a rouge lipstick 

Glam: Wearing her long tresses tied off her face in a high pony tail, she accentuated her flawless complexion with a dash of blusher, before adding a rouge lipstick 

The Westworld star finished off the glamorous make-up look with a rouge lipstick, a subtle smoky eye and lashings of mascara. 

Thandie, who has joined the cast of Line Of Duty for its fourth series, recently gushed over her co-star Vicky McClure, who plays DS Kate Fleming in the drama.

Taking to Twitter during a recent episode, she wrote: 'I love me some Vicky McClure!'

Monochrome look: Keeping her accessories minimal, Thandie complemented the sophisticated number with a pair of strappy black heels 

Monochrome look: Keeping her accessories minimal, Thandie complemented the sophisticated number with a pair of strappy black heels 

As she watched DS Fleming attend a crime scene in a disposable boiler suit, the BAFTA-winner joked: 'Of course @VickyMcClure still looks hot in a white hooded onesie!'

Seemingly equally enamoured with her castmate, The Replacement  actress responded: 'Love you @thandienewton you are creating quite a stir!'

Thandie also stars as Maeve Millay in HBO drama Westworld, which is set to return to our screens next year. 

Cop drama: Thandie is currently starring as DCI Roz Huntley in BBC drama Line Of Duty

Cop drama: Thandie is currently starring as DCI Roz Huntley in BBC drama Line Of Duty

Gushing: She recently gushed over The Replacement's Vicky McClure (R), who plays DS Kate Fleming in the drama

Gushing: She recently gushed over The Replacement's Vicky McClure (R), who plays DS Kate Fleming in the drama

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