The turnaround of the Royal Shakespeare Company in the past year has been amazing. Artistic director Michael Boyd was visibly jubilant at the company’s most successful Stratford season in 10 years, the slashing of the crippling deficit he inherited – and above all confounding the advisers who warned him Middle England would stay away from his current season of 17th century Spanish plays: “I’m glad my optimism about human nature has been rewarded.”