It is pledging to continue United Kingdom membership of the European Union single market and the customs union during a transitional period following Britain's EU exit in March 2019.
"Labour would seek a transitional deal that maintains the same basic terms that we now enjoy with the EU", Sir Keir told the paper. He says that should avoid a "cliff edge" situation for the British economy.
UK Labour Party would seek a transitional deal on Brexit that would allow the country to remain in a customs union with the European Union and the single market, Keir Starmer, the party's Shadow Secretary of State for Brexit, said in an op-ed in The Guardian newspaper.
"We will use every opportunity to defend Britain's membership of the single market and customs union on which so many people's jobs and living standards rely". "It means we would abide by the common rules of both", Starmer said, according to The Observer.
Keir Starmer has positioned Labour firmly as the party of soft Brexit.
Following his comments, a Labour Party spokesman told Reuters that Jeremy Corbyn's team proposed to continue the same "basic terms" of Britain's relationship with Europe during a transition period.
He did not put a time limit on the transition period, only saying it should be "as short as possible but as long as necessary".
The Conservatives said Labour's position was a "weak attempt to kick the can down the road". We would be free to have our own fishing and agricultural policies.
Officials from Britain and the European Union are to meet Monday in Brussels for a new round of Brexit talks. "Labour are still arguing from the sidelines".
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Labour's leadership has been criticised by opponents for a lack of clarity on what deal Britain should seek immediately after the EU.
Lib Dems are to force a vote on whether the United Kingdom should leave the European Economic Area (EEA) - and therefore the single market - when the Government's key Brexit legislation returns to the Commons at the end of Westminster's summer break in September. Our dedicated coverage of Labour's policies and personalities, internal debates, selections and elections relies on donations from our readers.
The Scottish National Party supported Labour's stance, but said it did not go far enough.
First Minister Nicola Sturgeon has given a cautious welcome to a change of emphasis from Labour on Brexit.
She added: "I would really hope that Labour gets itself into a position away from the hard Brexit position it's been pursuing".
"Not for some transitional period, but period".
Britain has published papers on everything from future customs arrangements to data, going beyond a brief set by the European Union to first make progress on three priority areas - the rights of expatriates, Britain's border with European Union state Ireland and a financial settlement.
Starmer added: "Remaining in a form of Customs Union with the EU is a possible end destination for Labour, but that must be subject to negotiations".