She worked on the restoration and preservation of many historic buildings in England throughout her career, including Winchester Cathedral and the Royal Pavilion.

She had decided by the age of 12 to pursue a career in the preservation and repair of historic monuments and buildings, and a male teacher was specially hired by the convent to conduct drawing lessons for Bennett.

[1] In this role, she undertook experiments on new stone cleaning techniques with the Building Research Establishment; under her guidance, the techniques were used at the Tower of London, the Jewel Tower, the Methodist Central Hall Westminster, Audley End House, Bolsover Castle, Holyrood Palace and the Sheldonian Theatre.

After she was made a senior partner at the Purcell Miller Tritton firm, she opened a branch office at Sevenoaks, Kent.

[1] She was made a fellow of the Society of Antiquaries of London in 1997 and became a member of the Order of the Holy Sepulchre in 1979, eventually being appointed dame commander.

She and her husband were frequent visitors to Corsica and were the only English members of the island's historical organisation, Fédération d'Associations et Groupements pour les Etudes Corses.