[tpm]

Ah ok now I understand. Don't know about Canada but the UK is certainly an exception in this regard. In Germany and rest of Central Europe the PM and ministers are not required to be MPs, in fact currently in Slovakia we have a interim government without any MPs at all. Also in Slovakia when a MP is made PM or member of government he is temporarily released from the parliament and a substitute from the party list is temporarily taking his MP place. In some other countries sitting MPs while in government still have to take care of their MP duties.