HOLDENBY FOOD SHOW, sponsored by Waitrose August Bank Holiday Sunday and Monday, 24 and 25 August. Open 11:00 to 17:00 both days. See Visitor Information for more details.   Just across the Northamptonshire fields from Althorp lies Holdenby House, a stately home whose royal connections go back over 400 years. Built by Sir Christopher Hatton to entertain Elizabeth I, it became the Palace of James I and the prison of his son, Charles I. Now a family home, the house is the splendid backdrop to a beautiful garden and Falconry Centre, where visitors can watch birds of prey soar over the scene of so much history.   Six miles from Northampton, Holdenby is a magnificent venue for corporate events and conferences, film and TV shoots and weddings. We also run an award-winning schools programme with projects on the Tudors, the Victorians and World War II.