It's lambing season at Blenheim, and head shepherd Shaun is monitoring the 1500 lambs due to be born. Most sheep lamb in the field without problems, but on a 4am round, Shaun has to intervene in a difficult birth.Meanwhile back at the Palace, social history researcher Antonia is hiding the toy ‘Marlborough Mice' around the Palace. It's a trail they provide for school groups and a unique way of engaging young people in the history of Blenheim.One element of Blenheim history, which still has importance today, is the way they pay their rent to the Crown, who own the land that the Palace is built on. Keeper of Palace and Collections, Kate, gets the unusual payment ready for a trip to Windsor Castle.Meanwhile, collections apprentice George, is set the task of cleaning some of the 10,000 books in the Long Library, a space once used as a hospital for wounded military and an evacuation centre for a boys school during the war.Never quiet, the events team are busy hosting the 20th anniversary of the annual Blenheim triathlon, which covers much of the estate, as we follow three newbies to triathlon who begin the day with a kit malfunction. On the far side of the estate, where the cycle route will pass, the forestry team are surveying the ancient woodland, and head of conservation, Filipe, is especially fond of one tree in particular.But, as well as conserving history, Blenheim is the most forward-thinking Palace in Europe, using innovation to make all departments more efficient and sustainable, and in a partnership with Oxford University, Spot the robot dog is creating a digital map of the palace to help the Palace conservation team - much to the delight of guests.