I currently have power to my garage which is fed from a 30amp fuse on the main consumer unit to another fuse box in the garage. This fuse box has 2 feds one for a small socket ring (3 double sockets) and the other to provide lights for inside the garage and security lights. One of the double sockets has a built-in circuit breaker and is used to supply power to a small pond pump and light (this is the only constant draw).
In addition to the garage I plan to build a big shed to be used as a small scale workshop. Rather than take a new feed off the main consumer unit I was planning on extending the ring and lighting circuits from the garage to the workshop. I will be using a few power tools but it is unlikely that the will be all used at the same time. Possibly use a dust extractor & saw or router at the same time. Can not see that there would be any greater a load than would be found in a modern kitchen.
Do anyone think there is anything fundamentally wrong with what I planning ?
Eric.