In reply to AJohnstone:
I don't know what that nutcase above is suggesting some random quack for, but please for the love of god ignore it along with the homeopathy.
Preface - snapped radius v badly mountain biking 3 years ago, tore tfcc with it, plate + 12 screws, for 6 months after bone healed I couldn't even open a door with left hand due to tfcc pain. Approx 9 months later I was almost pain free, no surgery
1) Go and buy a wrist widget. No, seriously, google it and buy it. Balk at the £30, and then once you have it get your mother to sew you a more robust version from velcro (as it will fall apart in a few months). 75% of TFCC injuries will slowly heal or become manageable just by wearing this (but I mean wearing it for like months on end). TFCC does not stop hurting because every time you open your hand it spreads your radius and ulnar apart a bit and that pulls on the tfcc. Wrist W stops this.
2) The best hand surgeon in the north is Doug Campbell in Leeds, who is one of the top hand surgeons in europe, advisor to things like the olympics, pga tour e.t.c. I would advise you to pony up £200 for an initial consultation, then ask (he is fine with this) to go onto the NHS waiting list for an MRA (like an MRI but with contrast dye). He has looked at lots of TFCC tears and understands the balance between repair, debridement, and leaving to fix. I went back and forth between like 5 crap consultants for ages until I just paid him for an hour and a half of his time. Listen to what he says and do it.
Best of luck.