(inevitably) free-lance contractors
There are plenty of councils employing Instructors on zero or irregular hours contracts, with the same employment rights as other council employees, so I don't see what is inevitable about it being freelance.
It seems to me that although CTUK were ethical employers in terms of trying to provide reasonable t&c's for the people who worked for them, they were in effect feeding the monster of public services outsourcing, a process that as time goes on and the 'undercutters' get to work effectively moves public money from the wage packets of Instructors to a handful of company directors. CTUK helped to feed the monster and then it ate them.
Hats off to CTUK for the way they improved cycle training. I feel for all their employees who will now be staring the gig economy in the face.