Took a trip to A&E and the nurse (who was probably the most sound person I've ever encountered in a hospital)* said that it probably wasn't broken and just a very bad sprain, the cast had moved and was if anything hindering the wrist healing.
Also the guy noticed the past 3 times we had been to get a new cast, the wrong cast had been put on.
All in all, a bit of a waste of a trip, but nice to have a bit of peace of mind. And my girlfriends loaded up on Tramadol now, some street value on the stuff.
Thanks for the help P&B, f**k yer NHS24!
*Insert Ultrasound guy joke here.