One problem related to water pump has been reported for the 2009 Mini JCW. The most recently reported issues are listed below.
Numerous engine related issues. Blown turbo, thermostat cracked, timing was redone on car, tmps sensor corroded, side marker lights corroded, water pump housing cracked, engine oil pan leak, carbon buildup on intake valves, oil filter housing needed replacing, I take replaced with "winterized" version all happened after 57000.