'which basically needs gutting'
it absolutely does not. You 'wanting' a different aesthetic is not the same as 'needs gutting'.
People throw that around like its the baseline thats expected when buying a house, its not its the utter extreme. Gutting is one step shy of knocking it down and starting again. Its the same with when people just assume every house needs a 'full rewire' when really thats exceptionally rare and most just need updates.
What you want is to redecorate, maybe add a new kitchen and bathroom although what's their is perfectly usable and doesn't really 'need' doing with any urgency by the look of it.
As for cost on changing things we redid our downstairs extension completely as the previous owner had wired and rebuilt buts themselves dangerously so we had to go back to brick. We moved the kitchen, added a bathroom and also did a rewire of the extension and new breaker and new flat roofs. Cost us £21k in the north east but we used a 2nd hand kitchen carcass so only appliances and the bathroom where completely new + all the work (roofs, plastering, electrics, plumbing etc...).
As for the rest of the house we just decorated it all ourselves, lots of days stripping woodchip and filling plaster, painting, fitting carpets etc... cost a couple of thousand. Redecorating is easy and basically just costs as much as you want to spend and can be done DIY.