The illustrator Quentin Blake is uncannily like one of his own creations: tousled, bright-eyed, quizzical, and apologetic about his summer cold. He greeted me warmly and conducted me down a dimly lit hallway into his lair, a studio giving on to a leafy London square, piled high with the tools of his trade: papers teetering on plan chests, jars of brushes, palettes of paints, toppling books — all the shambolic clutter of a busy artist’s life and work.