RCD splitting question

[High Tower]

The 16mm in question is a 30m run straight through joists 400m apart .SWA would have been a bit of a chew.
I can't see the problem,if its labeled up,how the distribution layout should be a concern.
Anyway if I change the CU for a dual RCD board and come from a way that's 80a 30ms protected and feed my new board that has 5 circuits,how do I allow for division of circuits at my new board?
For those who are thinking lack of competence,would I be ***** to sit here on a saturday night fishing for the answer with a missus pestering for some romance............?

Why are you here if you have the option of the jump??

U mad??

 

[pushrod]

Can i ask is this your own property or someone elses?

 

[piggyitm]

She's just made me watch the ****est film i have ever seen.....Valentines Day!
Obviously, it's now time for some punishment............