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Speaking at the the Centre for European Reform on Monday evening, Sir Keir will say: "There are some who say, 'we don't need to make Brexit work, we need to reverse it', [but] I couldn't disagree more. "Because you cannot move forward or grow the country or deliver change or win back the trust of those who have lost faith in politics if you're constantly focused on the arguments of the past. "We cannot afford to look back over our shoulder. Because all the time we are doing that we are missing what is ahead of us."

In a speech to the Centre for European Reform at an event at the Irish Embassy in London, he said: ‘There are some who say, “We don’t need to make Brexit work – we need to reverse it”. I couldn’t disagree more.
  ‘Because you cannot move forward or grow the country or deliver change or win back the trust of those who have lost faith in politics if you’re constantly focused on the arguments of the past.
‘We cannot afford to look back over our shoulder because all the time we are doing that we are missing what is ahead of us.’

In a speech at the Centre for European Reform thinktank, Starmer will say that joining the single market “would distract us from taking on the challenges facing people, and it would ensure Britain remained stuck for another decade.” 
“So let me be very clear: with Labour, Britain will not go back into the EU. We will not be joining the single market. We will not be joining a customs union,” he will add. 

In a speech at pro-EU think tank the Centre for European Reform, Sir Keir rejected that approach, arguing it would be a "recipe for more division".
He added: "There are some who say, 'We don't need to make Brexit work. We need to reverse it'.

Keir Starmer will set out Labour’s five-point plan for “making Brexit work” in a speech at the Centre for European Reform today.

Charles Grant, director of the Centre for European Reform think-tank, said the ministers’ statement “shows a hardening of the EU line on the protocol”. “The new German government is a few notches tougher on the British than its predecessor,” he said. “In recent years it has often been the French who have taken the hardest line among the 27 — but the joint statement shows they are not alone. EU governments now say that the arguments over the protocol are not just about Northern Ireland, they are about the UK’s international reputation as a country that respects the rule of law.”

According to Zach Meyers, a senior research fellow at the Centre for European Reform (CER), "if the French presidency gives up on an EU-wide directive to implement the minimum global corporate tax because of Hungary’s veto, then any alternative will be far less legally robust.""The European Court of Justice (ECJ) has already ruled that EU member states cannot stop corporates from taking advantage of lower tax rates available in other member states: when the UK was a member of the EU, it proposed to do this, and the regime was struck down."