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It would require a hard brexit to implement any sort of socialism. The EU has strict rules on state aid. Corbyn's manifesto would have breached various EU directives and if the UK had been more aligned with the European project the rules on fiscal policy.
Any sort of socialism? A decent social democracy would do.
There are no problems with the initial nationalisation and EU law. Later ... yeah, there are conflicts.
Most labour losses so far were brexitparty, and a significant lib/green move. Fighting against the 3 percent tory move could be defeated in the future, though I hope not in giving up all socialist values.