From an article in
Royalty ... unknown date ... by Brenda Ralph Lewis
After her marriage ".. Mary soon revelled in country life and the imposing beauties of the moors ... readily accepted by Yorskhire folk, who were not known for their love of "southerners" ...She preferred to concentrate on good works in Yorkshire. There she, especially concerned herself with the unemployed who proliferated in the north of England during the Depression years of the 1930s"
She served variously during the war. After her husband died in 1947, she became a semi-recluse for a time. Eventually she want back to work, touring Canada, Nigeria, and representing the Queen at Zambia's independence.
This was an interesting article but it didn't give anything about the marriage, only to say ...
"Fortunately, King George already knew and liked Lascelles, who was one of his shooting pals. Even so, Lascelles was no Sir Galahad. Fourteen years Mary's senior, he lacked charm and had such mournful looks that he was known as "the dismal bloodhound."