The former Prince Andrew , Sarah Ferguson and Peter Mandelson were skewered in tonight's opening Saturday Night Live UK sketch. It saw Andrew, played by comedian Jack Shep, taken into an office by MI5 in the wake of Princess Diana's death in 1997. It was quickly hailed as "incredible" by fans. One wrote: "I fear it's already genius." Another said: "Oh god perfect cold open on Andrew." Agents sit him down and tell him: "No one knows better than us how charming, capable, fiercely intelligent and