Godd questions, teenyuck!
1. Although our healthcare system comes pretty far down the league table of developed countries, I think there are far worse places to live than the UK. I am one of those weirdos that does not object to paying taxes for public services, so tax rates do not bother me. I think if I had to choose to live somewhere other than the UK, I'd choose the Netherlands. On my few visits there, it seems like a really good place to live. And their Royal Family are not an embarrassment like ours.
2. No, I have never run for public office. I can not delude myself that I could do a decent job of it.
3. I would bring in a system of national service which really meant service to the nation, not square bashing. I like to think that the country would be a better place if all our nationalised industries had not been privatised and then bought by foreign companies. I would disestablish the Church of England (separation of church and state, as applies in Wales). Overhaul the health, education and justice systems. That would take a lot of money, so I would raise taxes, but I would make the personal allowance a meaningful number (£10000+) and abolish higher tax rates. One tax rate for all, no caps. Try to educate the public to care as much about our children as we do about foxes.
In reality, even with infinite power and resources, you could not improve the lives of everyone. Tara Palmer-Tompkinson would not be better off if I was in power, for a start. Hence my answer #2.
4. To be honest, I consider that the worst off person in the UK is much better off than the vast majority of the worlds population, so thus far I have put more resources into helping overseas charities. If I am honest, I am not doing nearly as much as I could to help people in the UK or overseas. I still think I am doing more than most people though.
I really thought I was helping my country when I contributed to the Labour party in the run up to the 1997 elections. Maybe I was. These days I am not sure.