He was the Architectural Adviser to the National Trust for over 20 years, earning enormous respect as result of which he broke fresh ground when he fought for the rescue of the decaying Northamptonshire manor-house at Canons Ashby. It was the first time that Government funds, rather than the traditional family endowment, were used to save an historic house. He was also the curator of various exhibitions including "The Treasure Houses of Britain", held at the National Gallery of Art, Washington, DC in 1985-86. He also contributed numerous scholarly architectural articles to Country Life magazine between 1973 and 1995. He was appointed OBE in 1987.
Jackson-Stops developed a unique home in The Menagerie, a Grade II listed building at Horton, Northamptonshire, part of the estate buildings for the now demolished Horton House and seat of the Earl of Halifax. The building is a one-storey building with corner pavilions and a raised central area. The surrounding windows are by Gibbs. The work has most recently been attributed to Thomas Wright who undertook work for Lord Halifax in the 1730s. The saving of this unusual building was Jackson-Stops's own private achievement; when he first heard of the property in 1972, he found an architectural dream; here he restored one of the finest English Rococo plasterwork rooms, complete with Father Time, the Four Winds, and above the cornice 12 large-scale medallions of the Zodiac. Later on in the gardens he added two further follies and, with his friend Ian Kirby, created a romantic English garden which incorporated both a formal period-design an exciting modern planting. For Jackson-Stops, the Menagerie was his own country house in miniature and in the manner of a country house and in the tradition of the fête champêtre, he hosted a succession of parties, often accompanied by the staging of operatic works. A week or so before his death he gave what would be his final party to celebrate the opening of his "shell grotto" with its suggestions of the underworld. He died of an AIDS-related illness. A paint colour, "", has been developed by the paint manufacturers Farrow & Ball in Jackson-Stops' memory.
