The Cambridges this week hosted a reception at Kensington Palace in advance of their upcoming foreign tour. Photos of the reception were not clear enough for me to answer answer this question: when they host official functions at Kensington, are those held in the palace's state rooms, or in the Cambridge's private apartments?
In the past I suspect that official royal events at Kensington were always in the state apartments. But since Historic Royal Palaces renovated it and turned the lower 2 floors of the state block into public exhibition / function rooms, I wonder if those apartments still at the disposal of the royal family for official functions? And if so, would the Royal Household have to "rent" the rooms (as any other company / institution would do), or are they still entitled to use them free as back when the entire palace was under the control of the Royal Household?