Peggy Porschen 116 Ebury Street Belgravia SW1W 9QQ Tel: 020 7730 1316 http://www.peggyporschen.com Blackberry Crumble Cupcake: £5.95* Hot Chocolate: £4.75* Green Tea: £3.50* Welcome to Peggy Porschen, the girly cake cavern in the heart of Belgravia. According to Vanity Fair (and vanity is displayed here more than the cakes are) Peggy P knocks out the…