Mr Warren's Profession by Sebastian Nothwell

Lindsey Althorp, the only son of a wealthy baronet, has never worked a day in his life. Aubrey Warren was born in a workhouse and hasn’t stopped working since. Buoyed by Lindsey's optimism and fuelled by Aubrey's industry, the two men strive to overcome the class gulf between them. But a horrific accident reveals a betrayal that threatens to tear them apart forever.