[1] Whittle, the holder of a Master of Arts degree and a fellow of the Society of Antiquaries of London,[3] lived in Usk, Monmouthshire for many years,[2] but moved to Wilburton, Cambridgeshire in 2019.

[8] In 1991 she re-created the 15th-century garden of Sir Roger Vaughan at Tretower Court in Powys, Wales.

[9] She also discovered evidence of the 17th-century appearance of the gardens at Raglan Castle, now destroyed, which has been published in the Cadw guidebook.

[10] In 1994 Whittle led work on the compilation of the Cadw/ICOMOS Register of Parks and Gardens of Special Historic Interest in Wales to assist owners, developers and planners to manage the country's landscape heritage.

[12] John Newman, author of the Gwent/Monmouthshire volume in the Pevsner Buildings of Wales series, recorded his debt to Whittle in the foreword to his work.