I went back to the bike and checked. Its a Triax Nox2 21 speed road bike. It has a rear derailleur and is not an internal geared hub. I can spin the chain backwards and the gears spin but when I try and move the chain forward it won't budge. I took it off the the chain to see if I could spin it forward by hand but it won't move. I took the wheel out of the frame and it appears to me that the axle is still in one piece (its a bolt on not quick release).