@velaut I used to work for a company like that, except they have the money to give the “self-employed” tradies a branded van each to be used only for work with the business and then they did other work with their own car. You’ll have seen the vans around London.
Customer service team booked in jobs, logistics team coordinated jobs, one HR/admin person. Obviously you’ll be smaller scale and not have the brand, but if you keep the price alright people will book you.
There’s a shortage of some trades currently, especially in London. My brother is an independent electrician and has something like 16 jobs on the go. He had to make a waiting list for the rest…
The company I worked for affords the branding because they are expensive as hell, but people still hire them for all sorts of trades (plumbing, electrical, roofing, pest control, etc).
In terms of quality, people like to complain. There will be real quality issues. You’d get it anyway whether there’s real issues or not.
I’d say just don’t panic if you don’t make a profit on every single job at first. You need to on most, but getting word of mouth about your brand is important.
Also potentially start with trades which don’t require accreditation because I don’t know if you hold liability say if you sub to an electrician who turns out not to be up to date with accreditation and then a house he worked on kills a family in an electricial fire. Can’t go wrong with painters, etc.