"Also, Galloway isn't a member of any Government so I'm not sure what you mean by that."
Galloway is MP for Bethnal Green & Bow, so yes, he is a "member of Government".
Government governs. Galloway governs no-one. The Executive is the Government.
Galloway is not a member of the government; he is a single MP representing the "Respect" party which is a single issue (anti Iraq war)party. The government presently in power is the Labour party. He doesn't have any powers as such but can vote on new laws as an MP - Member of Parliament. The two are not the same.