I also thought lack of water would cause lack of flowers, but @janine.howell didn't mention the leaves and surely they would be wilting if water was an issue. I am more inclined to go with wrongly pruned now - could that be the cause perhaps?
If the plant doesn't flower next year, and you haven't pruned it in the previous 12 months then you will have to consider a different cause @janine.howell I don't know what else to suggest apart from pruning or lack of water.
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