When I told the electrician who wired my shed initially that I needed more sockets on the back wall (where there were previously none, he told me to get a four gang extension and just plug it in to one of the existing sockets (on the front wall).
I found a six gang socket with each being individually switched and connected that with a flexible cable which I secured to the walls with little cable clips. Since I don't have more than one machine running at a time, there's no risk of overload.
Accepting that there may be factors of which we are NOT aware, I think I would have considered the increase in cost of the shower installation and then invited at least three electricians to quote for the shed/workshop rather than just going back to the first man.
Of course, if he was your wife's second cousin, you would NOT have had the choice!
My very best wishes for a Happy, Healthy, Peaceful, Successful, Prosperous and Stress-free New Year.
MC
MC, Much the likeness .. the landlords father in law ... the shower with labour should have been free, I'd to pay for parts .. hence paying for the whole reel more than likely.
I've two other names for Electricians ,, should the wife ever stop spending the funds.
Cheers David