Originally comes with Suntour XCT, 100 mm, 9 mm QR, Coil?
TBH I can’t tell if that a straight or tapered steered?
Assuming it a straight 1 1/8, you seem to be in a between a rock and hard place, as you can buy ‘cheap’ forks like the Rockshox 30 Silver TK for around £100+ but will only give you a working fork, not much better than your original or the prices jump up to around £300ish for the likes of the Rockshox Reba/Sektor. Some people will bang on about 2nd hand forks, but then unless you buy them for £100 and budget to spend another £100 getting them serviced (possible to do at home, but going by your posts, I’m doubting you want to go that way), your potentially going to buy another set of tired forks.
RockShox Recon Silver TK maybe the middle ground you need, on CRC for around £150 (not an exhaustive search TBH), aren’t going to be amazeballs but should be solid decent performing fork which you could potentially upgrade the damper to make better later on.