When I had my shed electrified, there was a circuit breaker in the house for the outside sockets, which is where the feed for the shed was taken from. The electrician did a lovely job of fitting lights and sockets, but didn't put in an isolating switch in the shed...
It meant a lot of running up and down the 100' of garden when moving sockets around! And the issue of someone else turning the circuit back on while one is working on it is a major concern!