On the red carpet: Saoirse Ronan, Margot Robbie, Allison Williams & Rachel Weisz

Here it is: proof positive that Margot Robbie looks good in a bin-bag. This Saint Laurent dress is sequinned crepe but it photographs like a belted refuse-sack. Between it and Rita Ora’s EMA towelling robe it seems Will Ferrell’s Zoolander character is alive and styling.