A Very British Scandal | Preview (BBC One)

Once considered the most beautiful debutante of the 1930s, heiress Margaret Sweeny is in the midst of a divorce when she meets the dashing (and married) Ian Campbell, future Duke of Argyll.

What begins as sexual chemistry evolves into something more serious when Margaret begins not only to fall in love with Ian but also his crumbling ancestral seat, Inveraray.

But all is not what it seems in her marriage, and Margaret finds herself hurtling towards a scandal that will not only change her life, but the perception of the British establishment forever.

A Very British Scandal begins Boxing Day at 9pm on BBC One.