Question to the HM Treasury:

To ask the Chancellor of the Exchequer, if he will publish the (a) HMRC analysis underpinning its estimate that in the event of the UK leaving the EU without a deal the administrative burden on businesses from customs declarations on 2016 UK-EU trade in goods will be £13 billion and (b) the estimated number of additional customs declarations underpinning that figure.

The information requested is available at: https://www.gov.uk/government/publications/hmrc-impact-assessment-for-the-movement-of-goods-if-the-uk-leaves-the-eu-without-a-deal, in Section C.