[2] Her parents travelled around Britain for much of her childhood, and she was brought up by her Welsh grandmother Etta Williams and her English grandfather[3] at Llansamlet in Swansea.

She provided one of the alien voices in the Cadbury's Smash commercials in the 1970s, and made a brief appearance in the 1977 film The Prince and the Pauper (aka Crossed Swords).

[8] Madoc appeared in many theatre productions, including the stage version of Under Milk Wood, Steel Magnolias, Agatha Christie thrillers (And Then There Were None), the musical Annie, and many pantomime parts.

[citation needed] In 2008 she appeared at the Pavilion Theatre in Rhyl, playing the bad fairy in the pantomime Sleeping Beauty, with Sonia and Rebecca Trehearn.

[14] Madoc returned to situation comedy in 2009 and appeared in Big Top on BBC1, alongside Amanda Holden, John Thomson and Tony Robinson.

[18] In 2010, Madoc investigated her family history for the BBC Wales programme Coming Home and learned that she was a distant cousin of British Prime Minister David Lloyd George[19] on her father's side.

However, on 8 December, a statement posted to Madoc's Instagram account confirmed she had suffered a fall earlier in the week and was unable to appear in the production.