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If possible could anyone have a quick look over these steps I've made myself for cable sizing and the protection needed. Please let me know if I've missed out anything.

I also couldn't find a definitive answer for maximum permitted voltage drop percentage for 3 phase. I think it was 5% and 8% for lighting and power cable respectively.
Thanks in advance.

Cable size and protection - calculation image - EletriciansForums.net

Cable size and protection - calculation image - EletriciansForums.net
 
bear in mind that if using 90deg. thermosetting cable, the switchgear/OCPDs etc. and loads it connects may only be rated to 70deg.
 

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