LONDON — Britain must “back the Americans in this vital fight against Iran!” said Reform UK Leader Nigel Farage the day the war began. Less than two weeks on and he’s changed his tune. We “don’t have a Navy” and “cannot get involved directly in another foreign war,” Farage told a press conference on Tuesday. What’s changed? An energy shock. When the conflict had just started, and before it — predictably — sent oil and gas prices soaring and became a cost-of-living issue, he was all for it. But