I should maybe have said that what prompted my interest as to whether or not Hawksmoor was a freemason was a reference to the fact which I wasn’t completely persuaded was true (but am now) in an excellent short essay by James Campbell, ‘Sir John Soane and the Freemasons’, in a forthcoming publication Soane’s Ark:  Building with Symbols, ed. F. Saumarez Smith, which is being published by Factum Arte alongside an exhibition at the Soane Museum which reconstructs Soane’s great Ark of the Masonic Covenant, destroyed by fire along with the rest of the then Mason’s Hall in 1883.   Opens on 11 October.