We now have lots of very well paid jobs and a huge number of low paid jobs. There aren't enough middle paying jobs. This means millions of people need to claim in work benefits.
The age profile of the population is changing. We have lots more elderly people. The state pension has increased and now costs £125 billion.
Modern treatments just cost a lot more. Amazing things can be done, but they are extremely expensive. Also, people are living longer and that adds to the cost of health care.
The 1970s was a very difficult time for the economy. Then in the 1980s we had peak North Sea oil revenue and all the receipts from privatisation. We also let the public infrastructure fall into ruin. There are many reasons. It's complicated.
That is true. We could choose not to give people the best and most modern health care. We could choose to let pensioners and those on low incomes live in poverty.
All that may be so, but it doesn't mean taxes have to go on rising. Choices can be made.
That said, some of your points are questionable. Eg. I doubt very much that modern treatment is significantly more expensive than ten years ago. It hasn't changed that much during that time. I also see you've completely ignored the plausible examples I've provided - this form of avoidance is interesting.
The main thing you've missed, which is very odd, is the covid response. Shutting down the economy for two years and paying millions of people, quite generously in many cases, to do nothing. Plus all the billions poured into the pockets of fraudsters and botched contracts. Oh, and subsidising fast food takeaways. And paying for the trains to run throughout, carrying fresh air. The absolutely vast and crippling cost of that is partly being recouped through the stealth tax that is inflation, but clearly the government's hands are tied on tax when there are such huge debts to pay back. We are paying for the covid response.
Covid is perhaps the greatest example of all of how totally unsuitable government is at understanding and tackling problems. Idiotic modeling, insane diagnosis, crazed and absolutely devastating response on the social, psychological and economic levels. A hopeless Tory government, useless so called experts, massively egged on by a Labour opposition demanding longer and stricter lock downs. It was obvious to me what was going on from the start but a lot of stupid people still misunderstand even now - and are obediently walking into the exact same trap with the so called "climate emergency." But it is going on in different smaller ways. Nudge units and propaganda, in favour of this, not in favour of that, the followers always follow.
The bottom line is quite simple: you are either the sort of person who always believes what politicians tell them, is gullible and obedient, manages to believe that the state makes things better and should consume ever more power and money - or you are not. I'm not going to waste my time trying to persuade the credulous and cowardly amongst us otherwise. The fact that some people will defend, and regurgitate the propaganda of, those who are bumming them is beyond comprehension to me, and really too disgusting to contemplate.