Following his appearance at a hearing of the Treasury Committee in December, Hammond has said the government had analysed a “wide range of potential alternative structures” with the EU that ranged from “high alignment and high access to low alignment and low access”.
A letter from Hammond to committee chair Nicky Morgan, who asked for clarification, has now been published by the committee.
Hammond said: “The government is in the process of carrying out a programme of rigorous and extensive analysis that will contribute to the exit negotiations.
“Parliament has voted not to disclose material, such as this analysis, that would reveal the UK’s position in the negotiations.
“We have however committed to keep Parliament informed, provided that doing so would not risk exposing our negotiating position.”
Last month, 25 Labour MPs wrote to Hammond urging him to publish the analysis.
The letter read: “Without access to the latest taxpayer-funded analysis and research, Parliament will be hamstrung in its ability to scrutinise the government’s approach and to present the facts to our constituents.
“It is vital that light is shed on the modelling and analysis that the Treasury has carried out. The best way to achieve that would be for the analysis to be published in its entirety.”
The analysis is separate from a series of sectoral impact assessments provided by Brexit secretary David Davis in redacted form after intense pressure from MPs.
