By Jack Mendel Prime Minister Keir Starmer has announced the government’s new investment minister after more than 100 days in office, amid criticism from City groups it took too long. Former Darktrace chief executive Poppy Gustafsson has been appointed to the role, taking charge of the ‘scaled up’ Office for Investment. The appointment is part of what the government calls a Whitehall “shakeup” to reinforce its relations with business. This comes after the former holder of the office Lord Dominic Johnson said it was “totally ridiculous” not to have filled the role in the first 100 days. Gustafs…