The British government has placed a £86.5 million bet on ITM Power. The market, however, is not waiting for the payoff. Over the past seven sessions, the shares have tumbled 25.6%, erasing much of a rally that once looked unstoppable. At 1.39 euros, the stock now sits 46% below its 52-week high of 2.58 euros, reached just two weeks ago on 29 May. That high was itself a triumph....