Sandra Gidley was a Member of Parliament for Romsey, a seat of the House of Commons of the UK Parliament 1983-2010 which accordingly elected one Member of Parliament by the first past the post system of election. Before she became a member of the Parliament for Romsey, she first joined the Liberal Democrats in 1994. Later, she was elected as a councilor to the Test Valley Borough, a local government district and borough in Hampshire, England. Then, she became the youngest female mayor of Romsey.
And due to an incident that happened to Romsey's Conservative Party Member of Parliament Michael Colvin, Gidley was selected as the Liberal Democrat candidate for the resulting by-election. As the former Romsey's Conservative Party Member of Parliament Michael Colvin died in a fire at their home in the year 2000, a by-election in his constituency of Romsey was created. Sandra Gidley was lucky enough to win the by-election and also in both the 2001 and 2005 general elections. She was given the role as a spokesperson on women's issues and older people from 2001.
Moreover, she became the chairwoman of the Liberal Democrat's Gender Balance Task Force, an initiative to get more women into politics. In politics, no one can avoid having opponents. This is why Gidley too had her political opponents. And she was even described as "Hampshire's most expensive Member of Parliament". There had been concerns wherein they said that she was using tax payer's money to fund her political and re-election campaign. They also said that she broke the rules.