The most amazing feature of Highbury Hall is the gorgeous staircase. You can just imagine brides floating down it in a sea of silk and lace on their special day. I had these thoughts in my head as I walked up the stairs, pausing dead in my tracks to admire the most fabulous dress I had ever seen. This 1920s style gold sheath is the sort of dress that tempts married women into divorce in order to get married again and WEAR THAT DRESS! “It’s Jenny Packham” I was reliably informed. I thought this would be the perfect dress for Keely Hawes to wear as Lady Agnes when ‘Upstairs, Downstairs’…