On 31st August, the House of Lords Library published a briefing in preparation for the Second Reading and subsequent stages of the Bill in the House of Lords which begin on 4th September. The Bill would provide for the establishment of an independent customs regime once the UK has withdrawn from the EU and would also amend existing VAT and excise legislation to abolish the EU concept of acquisition VAT and introduce a range of delegated powers including the imposition, administration, collection and enforcement of customs duty.
https://researchbriefings.parliament.uk/ResearchBriefing/Summary/LLN-2018-0089