LONDON (Reuters) -British Prime Minister Liz Truss and finance minister Kwasi Kwarteng will meet the head of the country’s independent fiscal watchdog on Friday, after days of financial market chaos triggered by the government’s planned tax cuts. Truss and Kwarteng will meet Richard Hughes, chair of the Office for Budget Responsibility (OBR), to discuss the budget forecast process and economic and fiscal developments since March, the UK’s Treasury said on Thursday. Kwarteng unveiled a string of tax cuts last week in a fiscal statement that was not accompanied by OBR forecasts and which sent Br…