By Millie Turner Thousands of UK businesses risk “significant delays” to importing goods if they fail to move to the country’s new customs system before autumn, the government has warned. More than 3,500 businesses yet to transition to the Customs Declaration Service will be impacted when using the old system known as the Customs Handling Import and Export Freight (CHIEF), which will be axed at the beginning of October. “Businesses need to move now or risk being unable to bring their goods into the UK,” HM Revenue & Customs director of programme and operational delivery for borders and trade, …