Surrey-born Katy, 70, who lives in London, has twins J.J. and Georgie from a former relationship with actor Dean Harris.
In a stage and screen career spanning 50 years, she has returned to play Jo Grant, and other Doctor Who characters on audio and will star in Not A Well Woman on stage next year.
“I was born with severe myopia and little periphery sight, which was not discovered until I was six years old. My oddness as a child gave me a love of voices and at an early age I found I was able to do some funny voices – including Popeye!
“My life changed considerably after a serious car accident, which took years of reconstructive surgery and pinned bones in both legs. It ended my dancing dreams.
“I stayed with my sister in New York where I was offered a five-year contract with MGM, but with my parents’ advice, I returned to England to attend drama school.
“Afterwards, I landed the juvenile lead in the ground-breaking TV series Man At The Top with Kenneth Haigh.
“I adored working with Jon on Doctor Who and the chemistry between us worked from day one. It was a truly happy family affair with the whole team.
“Jo was a terrific character to play – a determined, gutsy, funny, clumsy little girl who was passionate about the Doctor to the point of offering her life for his.
“As audiences grew, I was thrown into a life of constant recognition and press attention – something we weren’t prepared for in those days.
“I left when the time was right because I thought it was good for the Doctor’s companion to change.