P. G. Wodehouse is known as a consummate stylist, and a lot is known about how he plotted and wrote his novels. Did he ever say anything about his writing in the first person? I'm particularly curious about how he wrote "as" Bertie Wooster, who has a very distinctive writing style that differs in some ways from Wodehouse's own.
Has he (or his biographers) written anything about how he developed Bertie's "voice" and then sustained it consistently across ten novels and over thirty short stories over 59 years?