As working environments go, they don’t come much more high profile than Number 10 Downing Street - and that’s exactly where this episode’s guests honed their senses of style. It’s no surprise, then, that both women have gone on to launch their own fashion businesses catering to women in the corporate sphere.    Samantha Cameron, wife of former Prime Minister David Cameron and founder of fashion label Cefinn, and Isabel Spearman, Samantha’s former special advisor turned image consultant and Telegraph workwear columnist, join host Charlie Gowans-Eglinton for this special episode looking back on life at Number 10 and how it changed their attitudes to fashion.    For more, visit telegraph.co.uk/fashion-unzipped-podcast/, and email your questions and feedback to [email protected].