LONDON—Britain on Thursday delayed the introduction of a range of post-Brexit import checks on goods from the European Union by around six months, saying businesses needed more time to prepare because of the impact of the coronavirus pandemic. The British Retail Consortium welcomed the move, but said it was needed because the government was not ready and the required border control posts were “little more than a hole in the ground”. Britain departure from the European Union at the end of last year created a full customs border with the bloc where previously goods could move freely, threatening the intricate supply chains between the two sides. Brussels immediately introduced checks and paperwork for goods moving from Britain into the EU, which has led to delays, higher costs, and a serious blow to some businesses such as in fishing industry that are struggling to compete. To soften the impact, Britain delayed …