according to her own official website she was.
http://www.sarah-brig....com/about_sarah.html
"At the age of sixteen, she landed a coveted spot in Pan's People. As the resident dance troupe of BBC Television’s top-rated hit-parade show, Top of the Pops, this all-girl group ruled the airwaves, attracting a rabid and devoted following. Even though BBC's new lineup meant that Pan's People would no longer grace the hit show, nothing could be more glamorous to a dancer than becoming a Pan’s Person.
Induction into the group required, however, that Sarah drop out of school, which was precisely what she did, despite pronounced parental trepidation. No one could have predicted then that this risky move would, in time, pay off so handsomely for Sarah and her legions of fans.
Before long, Sarah was spotted by choreographer Arlene Phillips ......"