What is the main conflict in Major Pettigrew's Last Stand: A Novel by Helen Simonson?

Major Pettigrew had been happily married to his wife, Nancy, who died six years earlier. The couple has one son, Roger, who came to them late in life. Nancy sought to spoil Roger while the Major preferred discipline. Roger has grown up to be self-important, self-indulgent, often thoughtless and disrespectful, particularly when it comes to the Major.

The Major regrets that the manners and social niceties of England seem to be sorely lacking in modern times. The Major, raised in a certain, proper way, becomes easily upset when others do not abide by his idea of what is right or how things should be done. This regret transfers directly to the Major's only son, Roger, who works as a banker in London. Roger is obsessed with career advancement and, consciously or unconsciously, shuns his father's Britain.