I see nothing wrong with this MACP op at all. Those troops involved will not be on PODL; they're at the behest of the Government for peacetime operations. What's the alternative? Continue to let the floods rise?
Blame the government all you like for not putting enough money into flood defences, cutting the size of the Forces, failing to invest in local emergency services, responding too slowly to a prewarned risk, building thousands of houses on flood plains, concentrating resources away from big cities where they're needed, plotting (as we all know) to get rid of the RAF and RN's SAR capability, and for whatever other mistakes they've made. But don't get annoyed when we are asked to help. It might not be the best duty in the world, but it's defending our compatriots. That has to be worth it.