LONDON - He's an eccentric English aristocrat with a lavish 13th century mansion that boasts three lakes, a ballroom and hundreds of cattle - but lacks one key feature: an heir. After an 18-month search for a relative to inherit his $15 million home, Sir Benjamin Slade, a childless baronet, has found an unlikely candidate: a rock star from Colorado. Isaac Slade, front man with The Fray, a Denver band that enjoys success on both sides of the Atlantic, contacted Sir Benjamin and jetted in for a two-day visit, trading sweat- soaked clubs for strolls through the picturesque 150 acres...