St Mary Undercroft, Houses of Parliament, London (William Drake 1999) | Fugue State Films There are of course differences between individual grand pianos, and cellos, and flutes, but of all musicians, organists have to be the most prepared to adapt, often at short notice, to enormous variation in the size, shape and scope of their instrument.  It becomes part of our training: we know that every organ will pose new challenges in terms of management, and we enjoy regaling colleagues with stories of encounters with particularly awkward instruments. This month's Learning during Lockdown focusses on the…