I agree with Oddboots. If the tax free allowance was raised to £15k for example, how many people would cease to pay tax, and not receive any form of tax credit thus reducing the burden of administration.
Why not introduce more tax bands - if a sliding scale can be done for stamp duty then why not have a 10% to £20k/20% to £40k/30% to 60k for example/40% anything above scale? The alternative is head towards a Danish style model where income tax is very high but state services [health/schools etc] are excellent.
By the same token - if a livable minimum wage was legislated for, or zero hours contracts made illegal how many people would be made unemployed as employers would have to do things the old fashioned way. It wouldn't play well as the unemployment rate would go up and the reality is that it is hidden right now.
I work for a company that operates a form of highly paid zero hours for some top up staff, though it does at least guarantee a basic income to them. Because the business has a lower overall operating cost, it can sell more services and has grown 600% in 3 yrs. The overall growth and numbers of staff made full-time and permanent would be considerably less had the normal employment model been followed. I think they would have just opened up in India or similar instead. But now there's a trained labour force and infrastructure the cost of switching is much higher so in many ways I can see the business argument for flexible employment if it will stop more and more work going offshore. We've gone way too far with zero hours though and in our own way screwed up the school leavers generation just as badly as the French did with a really rigid employment model.
I think Labour have truly screwed up the economy and wouldn't vote for them if my life depended on it, but I do strongly believe that very large businesses and multinationals do not pay a fair tax on their UK revenues, and I feel very strongly that small businesses are not given enough support, but exploited by comparison with large businesses being at the mercy of whatever the local council can dream up in terms of rates and also government levies. They are the equivalent of the middle income families who don't have the funds to find ways to hide their [non-existent] income outside of the PAYE system. This is an interesting read www.fsb.org.uk/stats
I wish I had the right answers and could afford to run for parliament though a degree in economics might be useful first 
I'm fairly comfortable reciting my times tables though so I'd be a sho-in for Chancellor!!