If anyone is interested in my views of the Castle Howard mausoleum a mere thirty three years after I published The Building of Castle Howard (Faber and Faber, 1990), I am giving a lecture on it next month. Being asked to give the lecture has got me back into Vanbrugh/Hawksmoor studies, which is partly why you have been reading less of me:-

https://www.mmtrust.org.uk/events.php