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To work around this, I added a "preCondition" to any impacted changeSet, to check that a column, index etc exists first, before we apply the relevant step. 

Remaining Questions:

1. Is this an approach, clean approach?
2. Should we re-number each changeSet id, because
   1. they are all in the one file
   2. We have removed loads of them
   3. They are now inconsistent and have big gaps in the numbering. e.g. 1-1, 1-2...1-21, 11-1, 11-2, 15, 16, 17, 18, 19, 20, 21