Would love to but there is only 24hrs in a day and I am no specialist in that area. Basically use as generic a SIC code as you can get away with no matter what your activity. Don't use one that requires you to be FCA regulated unless you are.
je joke of the day, the SIC is a declaration, if at the end your activity falls into regulated perimeter , you must be regulated, bassicaly touching 3rd parties funds is falling under