Open House 5

Open House weekend two started with this motley quartet. Open House: Trent Park: House of Secrets (Cockfosters) The Secret One Here's London's newest museum, opened just three months ago in a former stately home amid parkland beyond Cockfosters. Trent Park has been a socialite's retreat, a wartime intelligence centre and a university campus, the new museum showcasing only the first two of these. I last went on a tour of the house in 2012 just before Middlesex University sold up and moved out, since when an alternative educational proposition has fallen through and Berkeley Homes have built some stonkingly expensive houses in and around the mansion. But they didn't apartmentalise the lower two floors which have become a £14 visitor attraction, an admission charge kindly waived for Open House. Also our tour guide was the museum's Director whereas normally you just wander round, so even more of a good deal than usual. [50 photos] You start out on the ground floor in the world of Sir…