Award-winning Warren House combines a country house environment with a Greater London location. Set in magnificent four-acre gardens, the 19th-century property offers a variety of spaces for conferences, weddings and private dining. The standout space must be the Dining Room, which boasts an impressive Persian fireplace and seats 100 for dinner. Groups can take tours of the walled, newly matured Veitch Garden, which honours the local plant hunters who introduced so many species to these shores, followed by a drinks reception in the Ballroom. Getting there is easy too: Warren House is five miles from central London.