Neil if you are a window cleaner, I bet your round is very compact and your probably only work part time.
Of course it is.
I work four hours a day for full time money although I had already made my fortune in the outdoor advertising business I ran for 25 years. I was a partner in a Carburetter and tuning firm before that. Own my large detached Surrey home outright, I do alright.
With the greatest respect to you I don't think there is much I can be taught about business in the real world but at the end of the day you have to be honest and look at the basis of the actual service or product you provide and not try to gloss it up as something it is not
So your description of getting the right price and then sloshing water about is how you would describe your business.
But of course that is how everybody else runs there business, according to you, you’re right because it’s your opinion.
It is how any window cleaner, sole trader, big business big or small makes his money and I challenge you to tell me different.
Nothing to do with the actual reality of business. Just your opinion and what’s that worth to anybody who doesn’t have an identical setup as you, nothing.

That is the reality of a window cleaning business and as I said before and I quote....
"Out of interest Ewan and assuming everything is above board and legal what are the different ways a sole trader can run a window cleaning business?"
You still haven't answered my question.
and I doubt you will.
Neil,
With all due respect you seem to be pigeon holing every person on this forum.
As already mentioned, there is a world of difference between a part-time w/c, a full time w/c and an employer.
Are you really suggesting that someone who starts part-time, then progresses to full time, then employs others, then hits VAT thresholds, then submits tenders for council work.. are really all "just sloshing a bit of water about" ?
You dont think maybe there will be hiccups on that road?
You dont think others with vastly more experience could help you plan that road and make your life just that little bit easier?
If you're happy working alone and you're happy at the level you're at, then thats brilliant.
For those that would like to grow their business there are hundreds of questions they need answers to....and employing an accountant will not solve most of them.
Heres few things that spring to mind over and above "sloshing a bit of water about"
Limited Liability (pro's and con's)
VAT threshold
ISOH accreditation
Safe Contractor accreditation
Advertising
FWC or other trade body membership
Health & Safety
Risk assessments
ISO accreditation
IPAF accreditation
Employment Contracts
Your responsibilities as an employer
Health and Safety at work act
....the list goes on

If you are suggesting my corner shop is in some way comparable to Tesco then I would beg to differ.
Two extremes I know, but both are "just selling some stuff to customers" are they not?
You need to plan a business. Just waiting for "stuff to happen" is in no way running a business.