The government’s Child Tax Credit UK phone number is 0345 300 3900, staff here can provision new forms and answer customer service enquiries.
You can also request support in writing by contacting HMRC’s Preston offices:
HM Revenue and Customs – Tax Credit Office, Preston, PR1 4AT, United Kingdom.
The UK government offers child tax credits as a form of support for working families with children. Designed as a form of assistance and incentive toward meeting living costs, child tax credits are claimed by hundreds of thousands of UK families.