Stop skirting around the issue. What was the actual loan value? Or are you being intentionally vague because the going rate for a 2-bed end terrace was likely in the low tens of thousands, if not even single-digit thousands?
9% interest on a £30k loan vs 9% on a £175k loan is nearly 6x higher payments. Unless you're going to include your actual loan value then your argument is null and void.
EDIT: You edited in your values after I'd quoted and replied. A salary of £25k isn't far off the median salary now in 2022. When did you buy the house?