A colossal £6.8tn mega-city rising from the desert sands is hitting a significant snag. Saudi Arabia's Neom has already swallowed billions but is grappling with substantial construction setbacks. The Saudi government has now initiated a review that might dramatically reduce the scale of these bold ambitions. The futuristic metropolis was set to feature The Line, a mammoth chain of half-kilometre-high skyscrapers stretching 125 miles across the desert. With a budget of roughly £365bn and a 2030