I have spent most of the day at the annual Art Business Conference, held, rather spookily for me, in Church House, where my father worked in the early 1960s.   The best of the sessions from my perspective was the one on the phenomenon of private museums:  two in particular, the astonishing growth of the Auckland Castle Trust, in which Jonathan Ruffer has invested a mere £160M so far, first buying a historically important group of Zurbarans, then acquiring the Castle in which they have been housed, and now making it an agent for the regeneration for south west Durham;  and, second, Jupiter Artland Foundation, run by Robert Wilson, whose wealth is owed to homeopathic medicine.   What came across was how publicly spirited they both are, passionate about new audiences and youth programmes, not because they have to be, but because they want to be and recognise art’s social value.