He was born at West Hill, Llandaff on 3rd October 1901.
After education at the Royal Naval College, Osborne House on the Isle of Wight, he spent a successful career in the Navy, retiring as an Admiral.
There is a Wikipedia entry for him at 
Cutting from The Times, Tuesday, June 30, 1925:
LIEUTENANT G. V. GLADSTONE, R.N.., AND MISS JOHNSTON.
The engagement is announced of Lieutenant Gerald Vaughan Gladstone, R.N., son of Mr. and Mrs. J. E. Gladstone, of Llandaff, South Wales, and Marjorie Cecilia Mary, elder daughter of Mr. and Mrs. Goring Johnston, of Oakhurst, Palmerston North, New Zealand, and the Hotel Vandyke, Cromwell-road, S.W.
Newspaper Cutting in December 1925: :
LLANDAFF OFFICER'S NEW ZEALAND BRIDE
Naval officers formed a guard, of honour on Wednesday at the Brompton Oratory, Kensington, London, when Lieut. Gerald Vaughan Gladstone, of H.M.S. Hood, son of Mr. and J. E. Gladstone, of West Hill, Llandaff, married Miss Marjorie Cecilia Mary Johnston,. elder of Mr. and Mrs. Goring Johnston, of Oakhurst, Palmerston North, New Zealand.
The bride, who was given away by her father, wore a gown off silver lamé and silver lace, with long, tightly-fitting sleeves, her train, which came from the shoulders, being of white chiffonlined with the palest shade of pink, with an overdress of old Brussels lace; a long tulle veil fell from beneath a wreath of orange blossom, and she carried Arum lilies.
She was followed six bridemaids, Miss Betty Johnston (sister). Miss Biddy Gladstone (sister of the bridegroom), Miss C. Wylie, Miss I. Creagh, Miss M. Bowle-Evans, and Miss Cecilia KebbIe, who wore dresses of apricot, chiffon and silver lace, and swathed round the hips were sashes of various shades in greens and mauves. They carried, yellow and autumn-tinted chrysanthemums tied with apricot-shaded ribbon.
The two pages, Master Billy Haynes and Master David Carrow, wore white sailor suits.
Mr. Desmond Lysaght (cousin of the bridegroom) was the best man, and the Rev. Father Lawrence Mann officiated.
After the ceremony a reception was given at the Rembrandt Hotel, from where, later in the day, Lieut. G. V. and Mrs. Gladstone left, for Switzerland, where the honeymoon will be spent.
Mrs. Gladstone travelled in a sapphire blue velvet; coat, over blue crepe-de-chine, with a hat to tone.
Among the guests (many of whom came from New Zealand) were:- Sir Foster Goring, Lady Goring, and Miss Goring, Lady Ellenborough, Lady Blakeley, Mr. S. Baldwin; Mr. and Mrs. Lysaght, Miss Williams, Mrs. Smart Walker, Mrs. Scott, Mrs. Brabzon Combe, Mr. and Mrs. Dean, Mrs. Percival, Dr. and Mrs. Ackerley, Dr. and Mrs. Smith, Mrs. George Bloomfield, Mrs. Chapman, Mrs. Gladstone, Mrs. King, Mrs. Field, Mrs. T. Lloyd, Mrs. Sydney Johnstonte, Mrs. Howell, Lieut. col. and Mrs. Fitz-Herbert, Mrs. St. John Buckley, Mrs. St. Hier, Mrs. Ridderford, Mrs. Carrow, Miss Wilford, Lieut. Mitchell, Mr. and Mrs. Bowers-Smythe, Mrs. Collis, Mrs. Williamson, Capt. and Mrs. Gladstone, Mrs. Slesser, Mrs. Mattas, Capt. and Mrs. Lane, R.N. and Miss Lane, Mr. and Mrs. N. Ravenshill [sic], Mrs. Cecil Kebble and Miss (Pat) Kebble, Mrs. Brock, Mrs. Bowie Evans, and Mrs. S. Rodson.
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