By Sascha O’Sullivan Private members’ clubs are thriving against the odds, but it’s not just partying and posturing that’s so appealing, writes Sascha O’Sullivan When the dome sitting atop the iconic Camden club Koko burnt down, it was rebuilt with an almost obsessive attention to detail, using old photos to replicate the design which has loomed over the massive 1,500 capacity space a stone’s throw from Mornington Crescent station. Hugging the theatre famous for the queues of people who wait, often in the cold, for music of all varieties, is a private members’ club, designed with the same love…