The KMI Plus joint venture that includes contractor Kier Group has won a £250m extension to a contract with United Utilities. Kier and partners, Murphy Group, Interserve and Mouchel, got the extra work for their Non Infrastructure Capital Delivery framework.Today's deal extends the relationship with the utility giant, begun in 2002, through to March 2015. It's already delivered £230m and £400m of new build, maintenance and refurbishment work.