It doesn’t matter whether you are an employee or a contractor.
He owes you money and he has not paid.
The difference between being employed or a contractor’s is that if you are employed, you have the alternative of taking him to an employment tribunal to recover your money as well as the Small Claims Court.
My suggestion would be to just issue small claims court proceedings if you have not done already using the online system www.moneyclaim.gov.uk
if you are a director, then you will be down as a director at companies house but regardless, you are still entitled to be paid in accordance with whatever was agreed.
Just bear in mind that it could take several months and perhaps even up to a year before this gets to court.
Can I clarify anything else for you?