UK government borrowing costs rise over the past two days and reach levels described by one long-time economic reporter as the highest seen in the past century. The report says the cost of borrowing is already the most expensive among the G7’s wealthiest countries, and that recent movements push it further to new peaks. The piece attributes the worsening picture to market conditions developing over the last 48 hours and frames the trend as increasing the likelihood of a broader financial crisis. It does not provide detailed figures in the supplied excerpt, nor does it describe specific policy actions taken in response. Overall, the message across the available text is that investors are demanding higher returns to lend to the UK government, raising concerns about fiscal pressures and financial stability. The claim emphasizes a sharp deterioration in borrowing costs rather than a specific event such as a budget announcement, new tax measure, or immediate external trigger.