The singer visited Abercanaid Community School in January 2007 for a reunion, filmed for a BBC Wales TV special.
Many people remember Petula as a young girl spending time with her grandparents in Abercanaid near Merthyr Tydfil during the 1930s and 1940s.
She went to school in Abercanaid and Pontlottyn, and lived for a time with her aunt and uncle above Bert Rose's grocer shop in Ystrad Mynach.
Share your memories of Petula Clark's childhood
Petula talks to Roy Noble on BBC Radio Wales
Petula talks to Roy Noble - part 2 - 23 Jan 2007
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