Thanks for the clarification guys.
I am on my first character and have been using the B-sword both ways (with and without shield). I actually thought i was being clever as it seemed to give best of both worlds. Having a shield was useful when facing archers etc, whilst using it 2 handed gave me some nice hits (and yes seems alot faster).
Im level 30 now, so obviously looking to the future build (made loads of mistakes with this one).
So you would seriously recommend against using the above?
Consider the bastard sword a 2h sword only. When used with a shield, it gets a serious reduction in damage and speed.
HOWEVER, it is still a good idea to take a shield for when you are advancing on archers, or up a seige ramp. When you get close to the archer, within melee range, take the shield off and fight with sword only.
Also, the heavy bastard sword is better than the normal one imo.