Objectively, they are damaging policies.
That's a bit of a leap. Subjectively yes but objectively is too far.
Your posts only looks at one side of the economic issue in terms of what is happening right now rather than in the future. The present good rather than the big picture good in economic terms.
Example; Abu Dhabi deciding to diversify its economy in a dramatic fashion at the cost of prosperity is
right now objectively a bad economic decision in your terms. But in big picture terms then it's more complicated.
I'll play devils advocate on some of these points:
Increasing corporation tax. Will this attract more investors, or less?
You're asking a different question here. "Is this good for the economy" and "will this attract more investors" aren't really the same thing. I'll argue on the former as that's what I think you're driving at.
Raising corporation tax can vastly help the economy. The most obvious way is that the current 19% corporation tax rate on small businesses is actually lower than the basic income tax rate so we're sort of encouraging tax avoidance with that one. An equalisation of these could stimulate the economy through greater tax receipts.
Increasing minimum wage and labour costs.
This depends on the industry but pretty much every piece of research ever done into productivity of workers states that the security of their finances is by far the greater motivator into increased productivity. Stable workers who aren't going through economic difficulties are happier, they take far fewer sick days, they have greater resilience to change which is so important in today's marketplace and they raise better and more educated children who have a better chance to go on and make their own economic contributions.
This is why I used to be able to charge 5 times the rates of Indian programmers - the expectation of quality and productivity was higher on me due to the price point. Not a huge deal if you're working in a warehouse but if you're designing an aeroplane then that sort of thing is a real consideration.
Pushing up labour costs and the cost of UK produced goods? Good for exports, or bad?
Depends on competing prices and the good. That's such a hard question to answer because every industry is different. It sort of touches on the former point too so I won't repeat myself but taking into account the productivity rises from minimum wage rises should be part of this equation
Increasing workers' rights? Foreign investors more likely to move here, or less likely?
As per previous. A much more important point that isn't made here is do we even WANT foreign investors to move here and invest if the rights of the British people to a happy and prosperous life is actually a drawback to them coming?
Making it easier to strike?
Making strikes more effective?
Companies are symbiotic lifeforms; without the workers inside it, it's literally just a name in the Companies House register. Workers are valuable commodities to anybody worth their salt and they should have a way of ensuring that they have a powerful voice within the company structure. Capitalism is based on this idea that competing interests will find an equilibrium and fairness will ultimately stem from this. Removing workers rights to strike or protest is removing one of the pillars built into the capitalist system to ensure everybody wins. It's attempting to monopolise the labour/power market for lack of a better term.
But on a more direct and less philosophical point, you've forgotten the other side of the equation. How many workers from other countries with great skills and knowledge will be more attracted to the UK because of increased labour protections? How many more would take that jump to immigrate if they knew that they had power in the corporate model to ensure their labour was fairly compensated?
"Children of the 70's" seem to believe that striking is a terrible thing, mainly because back then it probably was to some degree. But we're not talking about workers striking down at Mrs Muffin's Bakery because we now live in a world of a global economy with billion dollar multinationals and the balance of power has shifted too far to the corporate side.
Lastly, there's something to be said about mindset here. I'm confident in my labour. I think I'm good at what I do and that if I lose a client here or there on a price point then there's nothing to worry about because I'll always make money when I need to. The economic value of my labour is greater than the economic value of the labour of less skilled workers in this dysfunctional society that we have. The working classes have become anxious about the value of their labour and the importance of it. They seem to think they're easily replaceable and have to bow to unfair demands in order to live. Some people are genuinely happy that they even have a job which is mental when you think about it.
"I'm happy that somebody will pay me money in order to sell the product of my labour at a greater price". I'm not saying that that is a bad situation because obviously arguments onm risk and security and everything but to be
grateful about it is madness.