The Welsh Government had no independent executive powers in law - unlike for instance, the Scottish Ministers and Ministers in the UK government. The Assembly was established as a "body corporate" by the Government of Wales Act 1998 and the executive, as a committee of the Assembly, only had those powers that the Assembly as a whole votes to vest in ministers. The Government of Wales Act 2006 has now formally separated the Senedd and the Welsh Government giving Welsh Ministers independent executive authority.
