Garage conversion CU

[Mr.Ian]

Hi all, attached garage to be converted to granny annex (front room / kitch / shower). Would it be best to run a supply to a new cu or to just wire it into the house rings ? Original downstairs (house) shower supply will be used to supply the shower in the annex as house one is being removed. New ring would be needed for new kitch? (no need for cooker supply as only worktop mini oven / microwave used). Lighting in new shower on own supply?.
Your thoughts.
Cheers.

 

[Guitarist]

If you are gentleman, you make sure that the kitchen sink has a nice window view for when the woman is washing up.