By Elliot Gulliver-Needham While we don’t know the details of a Labour manifesto yet, we do have one solid commitment from them: a sovereign wealth fund. “The National Wealth Fund will be a crucial tool in our armoury towards bringing about growth,” shadow chancellor Rachel Reeves has said. Senior City figures have been calling for the establishment of a fund for some time, with the most vocal proponents including Keith Skeoch, the former chief executive of Standard Life Aberdeen, and former City of London Lord Mayor Nicholas Lyons. The exact size, source of funding, or targets of the sovereig…