@Walkaround Your post perfectly illustrates why it's so hard to implement serious pro-growth policies. Lots of objections to any particular action.
Nuclear: there are US and French suppliers who can build at scale, and the new small modular reactor (yay!) contract went to Rolls Royce. China was kicked off Sizewell in 2022. But yes, we do need a much stronger domestic supply chain, which implies committing to a sustained building programme.
Housing deregulation: the main deregulation needed is to planning, which keeps land artificially scare in parts of the country where more housing is desperately needed. No major manufacturer sells jeans that fall apart when new, because no-one would buy them. The scarcity is what allows bad developers to survive.
Infrastructure underinvestment: if you take the family's weekly shop money and blow it all on one Michelin meal, you haven't "underinvested in food", you've just wasted your budget. UK infra is massively more expensive than peer countries. Phase 1 of HS2, for example, which runs over mostly flat land, cost eight times per mile what the Hokkaido Shinkansen did, which runs through tunnels. That's not a cherry-picked example: every other country does almost every type of big infrastructure cheaper than us, often many times cheaper. Much of our spend goes on reports, consultations, reviews, challenges, etc. that don't deliver anything. Phase 2 of HS2 got cancelled. Let's do it cheaper and deliver a full infrastructure programme, not a couple of bits then cancel.
Immigration: EU-pattern migration worked well for us: people would often come here for their prime working years then return home as they aged, contributing to our economy and tax take. The subsequent 'labour shortage' based schemes do the opposite: almost by definition they target underpaid sectors, bringing people who are very unlikely to ever be net tax contributors especially because there is tendency both to stay and to bring dependents who sometimes do not work at all. We need to strengthen our economy, and immigration is a great way to do that, but not that type.
"Britain is full": if your concern is that our infrastructure and services is overburdened then you should support policies that provide more housing, cheaper infrastructure, and a growing economy and tax base to pay for it.
Our non-immigrant total fertility rate is about 1.5 (2 is roughly the replacement rate). TFR of 1.5 means the population halves in two generations, it falls to a third in three. Tto sustain the population we have, never mind grow, we need immigration. But it's really important we have the type of immigration that strengthens our economy not further burdens it, if we want to be both economically and strategically stronger and more independent as a nation.