The Walls are closing in maybe - a Labour administration would not seek to 're-enter the EU Single Market, customs union or free movement (of people, I guess):
https://www.bbc.co.uk/news/uk-politics-62034754.
One of things it would do is "strike a new UK-wide agreement [with] the EU on veterinary standards in a bid to cut red tape for British food exporters". Sounds cool, though it raises the issues of regulatory divergence and the role of the ECJ. And I bet fish would come into it somewhere.
Mind you, 'make Brexit work' sounds a whole lot better to me than 'get Brexit done', if somewhat late in the day - 'look before you leap' and all that.