It’s a fairly safe bet that when director Beeban Kidron made her first film, the documentary Carry Greenham Home (1983), she never envisaged that 20 years later she’d be directing a whopping great blockbuster about a Chardonnay-swigging young woman’s desperate quest to get a ring on her finger - Bridget Jones: The Edge of Reason (2004). But then Kidron’s career trajectory has never been predictable.