Mackintosh left his money to charitable institutions such as the Jewish Homes and Mount Alvernia charities which provide residential care for the elderly of Gibraltar.

John Mackintosh wrote a will on 6 March 1938 allowing the provision of a public trust for the advancement of education in Gibraltar.

[1] He was keen in fostering links between Gibraltar and the United Kingdom, so much so that the educational provisions of his Will were designed to promote and strengthen these ties.

Besides the cultural and educational needs of the young Gibraltarians, he provided homes for the aged, poor and for an additional wing to be built as an extension to the then Colonial Hospital.

The hospital's John Mackintosh Wing with its 76 additional beds, was opened on 22 September 1969 by the then Governor and Admiral of the fleet Sir Varyl Begg who described it as a: Magnificent modern hospital splendidly equipped for medical and surgical work including an intensive care unit for medical and surgical work including an intensive care unit for cardiac cases and a nurses training school.

[3] Victoria shared her husband's many successes, supporting him in adversity and taking care of him in his autumn years, when his health began to fail him.

[3] A bust and plaque memorial to his name was unveiled on the western façade of the House of Assembly (now the Gibraltar Parliament) building facing the square in April, 1974.