Beginning in 2010,
The Tories reduced capital spending on maintaining the UKs infrastructure, in order to divert more money to the NHS and the State Pension (16% of GDP now (up from 12%))
Instead of investing say 10% (example), they invested 8%.
That loss of 2% has been compounding for 13 years now. Thats a cumulative 23% less in capital investment over that time period.
So the result is that a known (and fixable) problem from the 90s (was ignored for political reasons) has now become a giant national problem that will take years to fix, screw up the education of millions of chidlren, and cost 10x as much to repair due to inflation/borrowing costs.
At this point, the only thing we can do is get these people out of office as fast as humanly possible. Their decisions over the past 13 years have crippled public services in the UK.