Can't you benefit from meds like Harvoni or Sofosbuvir?
Don't know your current circunstances and if you are a suitable candidate for such a treatment, but I also had hep c for the same amount of time, and after 8 weeks on Harvoni in 2015 the viral load was undetectable, and so remains today.
Plus, not adverse effects ( in me), not a single one. Two out of said 8 weeks I was even trekking at the mountains. Nothing to do with infamous Interferon.
Also, National System paid for it all here, don't know about NHS (you brit, right?), but most def they will also cover it.
You problly had all the information about said meds already, but still worth posting it, I think.
Wish you the best.