The UK tax burden is set to reach a 40 year high by 2025. It's currently at ~37% of GDP, which hasn't been seen in the past 30 years.
The credit crunch destroyed government revenues, in response the Government ballooned the deficit rather than impose massive cuts. They've spent the past decade not growing spending so that GDP growth has caught up - in the process massively increasing the national debt.
It's great that young people are getting involved in politics. One can't but help think of the much attributed quote: if a man is not a socialist by the time he is 20, he has no heart. If he is not a conservative by the time he is 40, he has no brain.