Dalek Saucer Bloop?

I've just been watching The Dalek Invasion of Earth on DVD and noticed a bloop when watching with the CGI effects enabled - the shots of the Dalek ship when it has landed resemble the old 'tin-can' one, not the newer Dalek Saucer. Anyone else noticed this?

Are we to assume the CGI one is a mother-ship of some sort? I'll see if the Restoration Team guys know about this...