well the leading case on this is (still)
ready mix concrete
https://en.wikipedia.org/wiki/Ready_Mixed_Concrete_(South_East)_Ltd_v_Minister_of_Pensions_and_National_Insurance
if you are researching
rather than wondering idly what if ....
then you will have to read the case on BAILII
which is here - - -
https://www.bailii.org/
see ready mix - it is an important distinction as a result of the rights of those who are employed
so there is a lot to read
and I would honestly get an employment law text book and read the lot ! (I have)
and once you have decided on the employment status,
their tax affairs follow....
uber is another one - and is here
https://www.bailii.org/cgi-bin/format.cgi?doc=/ew/cases/EWCA/Civ/2018/2748.html&query=(uber)+AND+(employment)
I mean it depends on how much research you are doing.....
uber I notice was part decided by someone in my year at law school
( judge Roy Bean - -- bamma lamma lamma lam!)