Oh stop it.
You are either ignorant to how government borrowing is costed or you are just being ideological.
The global financial system has a massive impact on the cost of borrowing and it is going up for everyone, not just the UK and in terms of the markets reaction to economic performance - that is a long term view affected by 14 years of very little growth.
Yes, 30 year gilts, which are the ones all of the "High Borrowing Costs!" headlines are focussed on, are expensive, but that doesn't mean the government have to use that mechanism for borrowing. It's like shouting that consumer borrowing costs are at an all time high because Santander are offering a 10 year fixed mortgage rate of 10% - you would just look elsewhere for a shorter fix at a lower rate.
In 1997 public sector net debt (PSND) as a % of GDP was 37.2%, in 2007 (before the financial crash) it was 36.1%, in 2010 it was 70.1%. By 2019 (before covid) it had increased to 84.2% and by 2024 it was 95.0%.
As of October this year it was 94.5% - so Labour may very well have borrowed more but they are investing in public services which is actually stabilising PSND due to some growth.
Public Sector Net Borrowing (PSNB) as a % of GDP was 4.8% in 2023-24. It increased slightly to 5.1% in 2024/25 but is predicted to come down year on year until 2029-30 when it is forecast to be 2.1%.
But the really important indicator is Public sector net financial liabilities (PSNFL) - the is the true cost of government debt against assets (think of it a bit like a Loan to Value amount on a mortgage).
Up until 2008 PSNFL was about 34.1% in 2010 it had increased to 58.6%. By 2019 it was 66.3% and by 2024 was 81.2%. It's forecast to go up over the next couple of years until 27/28 when it starts to come down again, and is forecast to be 82.7% by 2029-30.
So in summary - what all that means is that under the last Conservative government, debt increased (as did taxes) but that money did not go into improving public services therefore the it did not improve PSNFL - the gap between the two widened significantly in fact. So - where did the money go? (and you can't blame Covid, because the gap was increasing pre-covid)
Labour are borrowing more initially, but they are doing so to invest in public services. They are fixing the roof, which in turn increases the value of the house and brings down PSNFL.
To stick with the mortgage analogy - the Tories borrowed against the mortgage and spent the money by pissing it up the wall or on holidays for them and their mates (quite literally in some cases), while the house fell apart due to lack of investment and the house's occupants failed to increase their earning potential.
Labour are borrowing more initially, but they are doing so to fix the roof and make sure the house is functional while supporting the occupants with education and a financial boost to get them back out to work. Yes, it increases debt in the short term, but over the next five to seven years, the value of the house increases and earnings potential goes up which means that Loan to Value gap gets a whole lot smaller.
It's exactly what happened in the between 1997 and 2001 and its happening again - if you dig into the funding figures for education and the NHS you can see it.
I think RR has got a lot of things wrong in this budget (the freezing of the basic rate thresholds, pensions and ISA changes are mad), but it is no where as bad as it could have been and some of the things are spot on (like the increase in dividend tax - and I say that as a higher rate business owner whose main income is dividends).
However, even with the things I don't agree with, I think some of it is a tactic - look at the dates when it is coming in - most are in 2 or 3 years time. She is giving the markets confidence that she is increasing taxes to manage the deficit, which will reduce borrowing costs - by the time we get to 2028 and 2029, if the investments in services have had the impact they should have, growth will have increased and borrowing will have come down, which means she can probably reverse some of these decisions!