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May 9 (Reuters) -
* HPS Investment Partners, Madison Dearborn Partners announce plan to bring together their UK regional network of businesses together.
* HPS and MDP also announce that Price Forbes will join group; all companies to operate under single holding company, KIRS.
* KIRS agrees buy Nevada, holding company for Autonet and Price Forbes businesses, for 254.9 million pounds.
* HPS and MDP say intend to explore options to consolidate and optimise group's capital structure in loan and bond markets, including debt refinancing. (Reporting By Simon Jessop)