On the go: The UK’s share of the EU’s pension is liabilities could be as much as €9.75bn (£8.52bn), Lord Bates told Parliament on Monday.

The estimate by the Office for Budget Responsibility in October 2018 was revealed by the Department for International Development minister in answer to a question posed by Lord Stoddart of Swindon, an independent Labour peer.

Lord Bates said: “As set out in the withdrawal agreement, as part of the financial settlement, the United Kingdom shall be liable to the Union for its share of the financing of the Union’s liabilities incurred until 31 December 2020, including pensions.

“The UK’s share, as set out under Article 139, shall be a percentage calculated as the ratio between the EU Budget contributions made available by the United Kingdom in the years 2014 to 2020 and those EU Budget contributions made available during that period by all member states and the United Kingdom.

“The Office for Budget Responsibility in October 2018 estimated the UK’s share of the EU’s pension liabilities, as set out in the withdrawal agreement, at €9.75bn.”