Shadow Brexit secretary Sir Keir Starmer said the option of remaining in a reformed EU customs union should be part of divorce negotiations.
And he said Labour wanted a deal which prioritises jobs and workers' rights, that migration rules had to change and that the European Union single market should be kept "on the table".
However, he failed to give firm proposals from Labour on freedom of movement, despite accepting that immigration rules would have to change, and on the European Court of Justice.
In a speech in London, Labour Brexit spokesman Keir Starmer said the largely pro-EU party would not seek to reverse voters' decision to quit the bloc.
Would seek continued "tariff-free trade" between the United Kingdom and the EU.
The election battle plan drawn up by Open Britain campaigners focuses on 20 seats held by prominent Leave campaigners, 18 of whom are Conservatives, including former Cabinet minister Iain Duncan Smith and Labour's Kate Hoey.
"The supporters of our organisations want to know where they can make a difference in this campaign and we are providing the tools for them to be able to".
In Wales, a largely rural country that has always been a stronghold of her Labour opponents but which voted in favour of Brexit past year, May took aim at opposition parties to press her argument that only she can win a good deal with the European Union.
Police ambush killer won't take stand in bid to spare life
His father's appearance on the witness stand came hours after Frein showed up in court disheveled and unsteady on his feet. What Eric Frein really needed was discipline and a good talking-to about how he was wasting his life, the lawyer said.
"The key thing is, I am no fan of the Conservatives but Labour and the Lib Dem's attitude to Brexit at the moment is scandalous, anti-democratic and appalling".
And more suspect they would get a bad deal than a good deal when negotiations are complete (37% to 31%).
Prime Minister May has said the United Kingdom could not remain part of the single market as it would mean not leaving the EU.
On top of this, the Institute for Government (IFG) think tank predicts 10 to 15 new bills and thousands of pages of secondary legislation will need to be passed by parliament to put in place arrangements in areas such as immigration and customs before Britain's expected European Union departure in March 2019.
The core list of talking points, which reads like a mini-pledge card, does not include details on how Labour would fund its pledges and instead combines attacks on Theresa May's record with the party's main priorities. It's what the Conservative Party has.
He added: "A divided Labour Party, propped up by a Liberal Democrat/SNP coalition of chaos, can't even agree amongst themselves on Brexit". And that means that there has to be movement of people to come and work in this country.
"What we need to do, I think, is to be grown-up and sit down and say 'let's negotiate the principles that underpin the sum - what's the money for, what's the basis it must be paid?"
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