@Abhannmor Labour were not pro Remain. They were divided. And tried to square the circle by offering a Referendum on any Agreement
I suggest you watch the 5 September 2019 episode of Question Time broadcast 5 September 2019. Emily Thornberry of Labour was on the panel.
Labour position was to offer a referendum with two options:
Option 1 - Accept Theresa May's deal (remain)
This was not possible as it was rejected by MPs three times. As per UK Law, subsequent to the Miller case, any Agreement had to be approved by Parliament.
Also, May's deal was pay to remain as the terms of the deal enabled the EU to reject all border solutions proposed by the UK forever and the UK would remain in the EU forever. This may explain why MPs rejetced the deal three times.
Option 2 - Remain in the EU
So, Labour were offering Remain or Remain.
Also, in the same episode of QT, Emily Thornberry stated that if Labour won the next election, she as Foreign Secretary would negotiate a deal that was best for the UK and Jobs, but at the same time campaign to remain in the EU.
McDonnell was upfront about this being the main reason Labour lost badly in 19
Labour lost in 2019 as traditional labour voters who voted Leave in 2016 voted for Boris. Jo Swinson had her arse kicked too.
The lesson to be learnt is that the primary function of MPs is to preserve democracy, This is achieved by honouring the majority vote and losers must consent.
And of course Tories could argue Brexit hadn't happened in 2019 and the benefits would be seen later. Meanwhile 4 years later....
The UK left the EU at 11pm UK time on 31 January 2020, with a transition period to 31 December 2020. As per Article 50, discussions on deals could only begin on 1 January 2021.
By middle of March 2020, COVID had begun to grip the World and did not subside until early 2022. Meanwhile Russia invaded the Ukraine in February 2022 and despite some of the most severe sanctions ever imposed on any country as recently recorded on the BBC, the war has entered its third year.
Also, there is the ongoing conflcit in the Red Sea and between Israel and Palestine.
Despite set backs such as COVID and Wars, benefits since the 2016 referendum include:
Unemployment has reduced
Wages at the lower end of the scale have increased
NHS has received additional funding in real terms