With something like 30 BAFTA, 15 Oscar and twenty odd Golden Globe nominations between them, this congregation of British Dames was always going to be a good opportunity to mix together these four lively characters with a plethora of archive and the odd sup of champagne. What we get is a mess. There's loads of cross-talking, plenty of witty asides, dead air time, hearing aid malfunctions, aching limbs and reminiscences by the pound. It's the very meandering, unstructured, nature of this chat that quite engagingly illustrates just how extensively varied the careers of these women has been…