Another problem with that rifle is that it cannot be operated left handed because it will eject the empty shell into the body of the person firing the weapon. I understand the British army then went and trained everyone to fire this weapon right handed.
However, tactically there are some situations in which a person holding a weapon left handed will have an advantage such as presenting a smaller target when firing around the left side of the corner of a barracade or building. So having a weapon that can be held southpaw is useful.
On the AR 15 they have a fixture in back of the ejection port that deflects empty brass to the side, rather than straight back into the person firing the weapon. Its a very cheap modification.
Just another problem with bullpups in general.