Management is asking for a light on the garden shed. It's around 5
metres from the house with a paving slab patio between the two. There is
a possible route round the edge under some block paving and then under
a gravel run.

Could the supply be taken from, say, a fused spur fed from the nearest
internal 13 amp socket (the utility room)? If so, what cabling and
protection would be required between the two?

This is not necessarily DIY but I would like an idea on what to expect
if we go ahead and put it out to a professional.

--
Frank