I think if you go on the lines of "I'm a self employed window cleaner trying to earn an honest living" rather than "I run this empire of twelve EC workers, six vans, three heated tanks and a partridge in a pear tree..."
If the machinery in the shed isn't noisy/polluting then what's the prob?
A relative of my wife has a little window cleaning empire and when he started he lived in a terraced house and no off street parking - I know he had a nosey neighbour who caused problems of the "He runs hoses across the path to fill his vans" type of thing.
- I'll give him a call and get back to you because I know he continued trading and the council intimated that the caller was often complaining about trivial matters.
One classic was "Your hose across the path means my son can't ride his bike up and down the pavement!" to which the obvious reply was "I thought it was illegal to ride a bike on the pavement!"
But I think he just had to put a board over the hose and a hazard sign out.
Strewth, we've got enough to put up with with chav lazy neighbours without having to put up with objections to an honest days work!
Rant!