Born 1960 in Wolverhampton, England, Riddoch moved with her Scottish parents to Belfast in 1963, then to Glasgow in 1973, where she attended Drewsteignton, a fee-paying private school then located in the affluent suburb of Bearsden.
Riddoch was born in Wolverhampton, England, in 1960. She moved with her Scottish parents to Belfast in 1963 and then to Glasgow in 1973, where she attended Drewsteignton School, a prestigious private institution located in the affluent Bearsden area.