This is sentence from novel 'the Death of the heart'
From the business, and from interest on the residue of his mother's capital, Thomas derived, at present, an income of about two thousand five hundred a year.
The novel's time period is 1930s in London. I thought two thoudand five hundred means £2500... But that is so little as a year income + interest... Thomas is rich busniessman. Is that money is big money that time or I misunderstood the amount of money?