What sort of route does it need to take....what will it be supplying...do you have rcd protection...If you have a type AC rcd this will need to be changed to a type A...... Minor works cert needs to be issued. So the answer is god only knows
Basically, you string a catenary wire between the house and the shed, (there is a specified height, but I can't remember it at the moment), and you suspend the cable a few inches below from this wire using loops such as loose cable ties.
If you Google 'How do I erect a catenary wire for cables', or look on You Tube, there are lots of examples on how to do it.
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