Margaret Phillips undertook the challenge of performing the complete organ works of Bach in recital, not only once, but twice, in 2015.  The preparation for this would seem to be utterly daunting, particularly as the two organs she was using for performance were very different in size and style: the first being the 10-stop Peter Collins organ at the English Organ School and Museum in  Milborne Port, Somerset, the second being the 2012 Richards, Fowkes & Co instrument at St George's, Hanover Square, in the West End of London, with 3 manuals and 47 stops. Margaret has given us permission…