IT WAS one of those nights that explained why the UEFA Champions League can be so marvellously captivating. Valencia hosted Chelsea amid the soaring shabby chic splendour of the Mestalla stadium, 43,000 spectators perched on the precipice, bathed in the glow of floodlights sitting behind them, illuminating the orange, red and green cauldron below. No wonder they call it one of the most scary stadiums in Europe. It is surely the steepest, an arena best suited to Sherpas and mountain dwelling creatures! Chelsea had already given their superbly balanced group the game of a lifetime in their 4-4 draw with Ajax in London. This encounter wasn’t quite as technical or brimming with excellence, but it was dramatic, intriguing and certainly kept the crowd on…