Marian ...
was just 'a lttle'
on
my part as I cannot say I'd ever heard of an 'Umbrella Firm' until
you mentioned the expression. But then ...
...
that would hardly be
surprising ... since
I've been
retired for ages.
So, I took the opportunity to look up its
definition on the
Wikipedia website.
Here's what it says in the
opening paragraph:
Alas, I am still none the wiser
... and, since it's a leng~thy article, copying the
whole thing out would take me (a slow typist)
virtually half the rest of the night.
So I would respectfully suggest that you go to the address bar, insert 'Umbrella Company' Wikipedia' and
yourself.