I have just put down Paul Torday's "The Irresistible Inheritance of Wilberforce". In contrast to the reviews I've read, I liked this more than his first novel "Salmon Fishing in the Yemen".
It's told in a similar vein, but is a much darker tale about delusion and self-interest. We meet Wilberforce near the end of his demise and witness, in four vintages, and in reverse, the journey that took him from self made computer nerd to penniless alcoholic.
Over the course of a few years Wilberforce manages to find and lose wealth, friendship, happiness and love. He destoys himself and everyone around him, all the while kidding himself that it is neither his fault, nor his responsibility.
The characters are not particularly likeable, but they are very human.