Thank you all for the responses, my mate came around this afternoon and has broken it down a bit more simply for me.. In short we are going to run 10mm SWA off its own circuit from the main CU (he is going to cover that end as its way above me) This will run direct to the garden room CU which...
Was only thinking to do so on the basis that the cable is already there and if I do need more capacity in future the first run of 4mm is easy to access and switch to 6mm, but understood.
And thank you I thought that might be the case with the RCBO.. Would I just feed the garden room CU through...
Sorry if this is the wrong location, please move or direct me to correct place if so!..
In short, I'm wondering if anyone could offer comments or advice on my intended electrical run to a garden building?
From my consumer unit in the garage (main household box) there is already a 32A MCB...