Among those of a certain age, no pop group of the 1960s provokes a debate quite like the Monkees – neither the Beatles, who now represent the establishment they once threatened to overturn; nor the Rolling Stones, whose shock value resides in a shameless career of cultural appropriation rather than the pursuit of sex, drugs and rock’n’roll; nor the Who, half of whose members died before they got old, but who kept touring regardless.