4 cars and two motorbikes here and all are on seperate policies. Over the years I have managed to rack up maximum no claims on each.
Looked at the multi-car policies but they were far more expensive than individual ones.
Col, if you mention that you have another car etc.... you generally get a hefty introductory discount anyway.
Currently insure all 4 cars (3 with swiftcover and one with KM) and 2 bikes (both with Bennetts) fully comp inc business use for £854.
Its great being older