The ones I was thinking of looked very much like the "other" terminal blocks/strips that you often see in household wiring.

Not that I need that exact kind, but they were cheap and neat. The ones you've linked look like they're tophat DINs and need wiring up to link together.

In theory I could get the single-pole blocks and daisychain them together to make what I want, but I'd prefer something made for the job as it were, especially if I'm using mains. This is to split one 240VAC input out to 3 or 4 bits of kit (ie transformers 'n' stuff)