We already have a high tax economy at a time of high price rises. Huge spending commitments cannot be afforded. Extreme left policies always reduce investment. So even less chance of growth. We need growth in the economy more than anything
Yet the EU, with far higher taxes than the UK has, far better growth, since the pandemic, growth is overall, double that of the UK.
Europe, in general, is more left of centre than the UK is.
Tax rates are just one aspect of growth, we had a very low Corp tax rate for several years, made not a jot of difference to growth.
I wasn't a fan of some of corbyns 2019 manifesto, free broadband for all, was crackers, why should the tax payer fund BB for the wealthy? but most of his plans were, in a european context, not that extreme at all, even the Tories have had to take back some rail and if they win again, nationalise water too.
Yes JC should have been much stronger on Brexit, agree there but difficult when the country has voted for it.