St Lukes Church Kilmore Street, Christchurch, New Zealand, in June 2011  /photo BeckerFraserPhotos We UK organists have our worries and niggles, but coping with the effect of a 6.3 earthquake on our livelihoods isn't one of them.  The Cathedral in Christchurch, New Zealand had to be demolished after the earthquake in 2010 was followed by another in 2011, and the building of the Cardboard Cathedral in its place has been news around the world.  But the second quake also left scores of other churches, with their organs, in a state of ruin and collapse.  Once the…