Ha, thanks fella. Success though! I just managed to get in with the trusty old coat hanger! Now the door card is off I can have a look to see what's wrong with the lock. It's very weird though, nothing's really broken, it just seems that when the door is locked then unlocked you can open the door fine but if its locked, then you try pulling the handle it seems to dislodge something and when you unlock the door you cant open it until you tug on the rod, then open from the inside.
For now I guess I just have to remember not to pull the handle before unlocking it...!