Liam Fox's Department for International Trade (DIT) has been criticised for falling behind schedule on its Brexit responsibilities and risking the future of British business as a result.
The work of the DIT - which is in charge of developing post-Brexit free trade agreements - has been put under the microscope as part of a National Audit Office (NAO) report, which found the department was struggling to develop specialist trade skills among staff and has had to "adjust" its timeline.
Reacting to the NAO's findings, Labour and Co-op MP and chair of the committee of public accounts Meg Hillier said the department was risking the future of UK business.
"Failure to get the right trade deals in place from day one of Brexit could mean higher prices, lost jobs and companies going out of business.
"It is deeply worrying that the NAO's report says DIT is already behind schedule and it is not clear how it will be able to get the negotiators it needs.
"The department urgently needs to talk to British businesses and work out how to help them secure their future after we leave the EU."
Her comments will raise concerns over the work being done under the leadership of International Trade Secretary Liam Fox, who just months after the Brexit vote reportedly accused British business of failing to prepare for new trade deals he was set to negotiate, and for becoming "too lazy and too fat" on previous successes.
"Delivery of the work streams will be challenging and DIT has put back some of its delivery milestones as the timetable for legislation and the overall negotiation process has moved on," the NAO report said.
It also said the civil service model, which sees staff move every few years, is "not best suited" to developing specific trade and negotiation skills, adding there will be a "premium" on retraining and recruiting outside staff.
"Considerable work will need to be done to build skills that have not existed in government for a generation," the NAO said.
The NAO report went on to detail the £25 million in additional funding granted to the DIT for EU exit work by the Treasury over the 2017-2018 financial year, covering administration costs, capital and programme funds.
It also applied for a new tranche of supplementary funding in September to be doled out in 2018-2019, though it is not yet clear how much DIT will need to fulfil its obligations.
The report said: "While DIT continues to plan for successful delivery on the key scenarios, uncertainty around the nature of the UK's future relationship with the EU and any implementation period mean that it needs to be flexible and keep its plans under review.
"As yet there is no final cost associated with DIT's role in EU exit."
However, the review said the DIT did recognise the "critical importance of engaging with stakeholders" in order to deliver a smooth and orderly Brexit and "avoid damage to its own reputation".
The DIT defended its progress, saying: "Overall, our plans are on track and we have met every EU exit delivery milestone to date.
"This is not slippage, we have deliberately adjusted some downstream work strands as a result of the changes to the EU exit negotiation timetable."
A DIT spokesman added: "The NAO report recognises that as a new Department we have done a significant amount of work and now have an international team of more than 3,700 people.
"Furthermore, our specialist 'Trade Policy Group' includes more than one hundred people with experience of working on trade deals, including those representing UK interests in free trade arrangements for TTIP and CETA.
"The final shape of our capability will be determined by the outcome of EU Exit negotiations."