Britain is facing a “divorce bill” of up to 20 billion euro (£18 billion) as the cost of leaving the European Union, it has been reported.
The Financial Times has calculated that more than 300 billion euros (£270 billion) of shared payment liabilities will have to be settled in Brexit negotiations.
The 20 billion euro “upper estimate” was said to cover the UK’s share of continuing multi-year liabilities including 241 billion euros (£217 billion) of unpaid budget appropriations, pension liabilities of 63.8 billion euros (£57.5 billion), and other commitments totalling around 32 billion euros (£29 billion).
The FT said its analysis represented the first attempt to quantify the UK’s liabilities on leaving the EU, with some officials in Brussels warning that the final figure could be higher.
The Government refused to be drawn on the report. A spokesman said: “As the Prime Minister has said, we will invoke Article 50 no later than the end of March next year. We are not going to provide a running commentary on leaving the EU.”
The disclosure may cause further jitters on foreign exchange markets following a tumultuous day for the pound.
At one point on Wednesday sterling lost almost 1% of its value against the dollar during the course of exchanges in the Commons, before staging a rally.
Theresa May is continuing her mini-tour of European capitals ahead of the EU summit later this month with talks in Madrid with Spanish prime minister Mariano Rajoy, while Boris Johnson makes his first appearance before the Commons Foreign Affairs Committee since becoming Foreign Secretary.
The Prime Minister has angered many Conservative backbenchers with her refusal to commit to giving MPs a vote on her Brexit strategy despite growing calls for more clarity on the plan before the formal process of leaving the EU is triggered.
During an at times heated Commons debate called by Labour, a series of Tory MPs lined up to insist that greater transparency was essential to protect British jobs, businesses and investment.
Challenged at Prime Minister’s Questions, Mrs May insisted suggestions that Parliament would be unable to debate issues around Brexit were “completely wrong”.
However she came under pressure from Jeremy Corbyn, who said the Prime Minister was pursuing a “shambolic Tory Brexit” to appease her backbenchers.
The Labour leader said the Government offers “no strategy for negotiating Brexit and offers no clarity, no transparency and no chance of scrutiny of the process for developing a strategy”.
Meanwhile, the Open Britain campaign highlighted 2008 comments in which Mrs May backed parliamentary votes to define Britain’s negotiating position in the EU.
She told MPs they should have “a statutory scrutiny reserve so that ministers would have to gain parliamentary approval before negotiations” with other EU member states.
Commenting for Open Britain, Labour MP Phil Wilson said: “The Government’s negotiating hand would be strengthened if they had clear plans backed by a strong parliamentary mandate.
“This is something the Prime Minister used to support. I hope ministers will now listen to MPs on all sides and give Parliament a vote on the terms of their Brexit negotiations.”