Sorry not sure what you are saying, don’t know what a scam card is.
I guess by JIB you mean an ECS gold card as I said before you wouldn’t get on most of the sites I work on without one (Maybe a basic CSCS if you were a Labrador)
Yes I know people can run businesses and work without any of this stuff, word of mouth mates and contacts that have been built up over the years.
It was a different world then Didn’t have to much health and safety ,never heard of risk assessment, method statements etc and all the other bulls***(Even completion certs )
The OP was asking what he should do for the future ,the days are passed when you turn up on a site with a bag of tools and make it up as you went along.
I have questions do you think that you would have a better chance, of getting quality work being in a scheme or not, that is the question ,
How would you convince a new client that you would perform and warranty your works?