The Court of Appeal has refused to change the sentence of Valdo Calocane, who killed three people in Nottingham last summer. The 32-year-old was given an indefinite hospital order after admitting the manslaughter of Barnaby Webber, Grace O’Malley-Kumar and Ian Coates by reason of diminished responsibility, and the attempted murder of three others last June. The Attorney General referred the sentence to the Court of Appeal in February, with lawyers arguing last week that Calocane — who suffers from paranoid schizophrenia — should be given a “hybrid” order where he would be treated before servin…