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I'm 5'10" and the 56 is perfect for me, so I'd certainly be looking at the 58+ if I were you.
I sorted the metal out myself in the end. I didn't really want to deal with a month turnaround from Wiggle, so I used some metal epoxy resin, dabbed it on, and left the frame at an angle in a bike stand overnight. It's absolutely fine now.
Here's how it looks now. I'm going to pop some decent road drops on for city riding come payday, but other that, I can't fault it. Maybe get some of the black scuff-guards for the saddle if I'm feeling extra tarty, but that's about it.
I've been using mine almost daily for a month (~8 miles a day, with a few longer rides too).
The frame rides fantastically - a nice solid and responsive ride, good for weaving around some of Sheffield's more potholey streets. It's a great accelerator too, really impressed with it.
Comfort-wise, I found the seatpost and stem specced with the 56 a bit stretched out for street riding as it's all very much track-based. After swapping them out, it's a lot better, although I'm still thinking about getting some shallower road bars for a bit more comfort. The saddle is bloody lovely though.