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You're unlikely to find one person who will do all that. I can do all of those jobs but I generally try to avoid doing it all on the same job, too complicated to explain why really, just doesn't make as much sense as getting an electrician, plumber and decorator to do it all separately.
Get an electrician and plumber in and don't bother them to fix the decorative stuff, then get the decorator to come and fix everything up. You can't really expect a skilled electrician to get the decorating right anyway. The decorator should be able to fix the bathroom sealant although it's a job most people hate doing.
It sounds like the job is too small for the kind of building firm that employs 6-12 people and would have individuals with those skills under one banner.
How do I find such a person in West / Westminster through which I can
My experiences of MyBuilder or whatever have been weak, i'm not sure they are a solution in London at least; nobody wants to do small jobs. But taken together these jobs require different specialisms - so it feels like one medium sized job for someone who can either do all these things (unicorn) or knows other people willing to do them (more likely).
How do I find that person?