What's the purpose of these two multi plugs on the premier wiring loom?

I assume that the indicator part is to connect up some warning laps on the dash?

They provide additional connections for switched live and perm live for accessories etc, as well as repeaters.

I use it to connect up my optimate, intercom etc.

I didnt think they were ideally designed tbh, i would have preferred some extra tails in the middle of the loom, probably better if you have a larger car though.

No, they are no better in a bigger car. I am putting one in golf track car for a mate.

I recomended it to him as I didnt have time to do it from scratch.

Just pleased I spent his money and not mine