By Lars Mucklejohn Chancellor Jeremy Hunt is set to unveil more details on the government’s plan to sell its shares in Natwest to retail investors at next week’s Spring Budget, alongside wider reforms to boost UK capital markets activity. Hunt is expected to give more clarity on when the retail offer could begin and how much the government is looking to raise. He said in November the Treasury would explore options to launch the offer within 12 months. Holger Vieten, a director at UK Government Investments who is leading the sale plan, told MPs earlier this month that “the very earliest” the re…