Newcastle United’s owners, the Saudi Public Investment Fund, are showing no signs of slowing down their seismic spending in football. PIF‘s £305m takeover of Newcastle in October 2021 fired the starting gun on an investment spree that has seen them pump hundreds of millions into the North East club. However, that level of expenditure is utterly dwarfed by what they are spending elsewhere in the world. The most expensive sporting investment by far will be the 2034 World Cup, for which Saudi Arabia will be awarded the hosting rights as they are running unopposed. The Saudis have unveiled designs…