They were not cheap really £60 for 4. I bought some A4988 drivers from eBay for £10 for my I3, maybe I should have gone down that route.
On the bright side I printed something, not recognisable though, extruder is still motionless.
swapped motor sockets E motor turned fine, so it's not the motor. The driver appears to not work in any socket, so maybe it got short circuited somehow on first start-up, that was the only one I didn't adjust. When it didn't move I did adjust pot then but still nothing, and my hotend was at 210 degrees.
Tech support is talking to his manager, possibly thinks it's a bad board, but maybe I'm just not careful enough putting them in?
I however didn't try using a another driver in the E socket, I'll try that tomorrow to see if that's the problem.