Silly me, I thought that agreeing a deal with a guy was agreeing a deal with the guy. I've omitted a few key details deliberately because the unions are such a stitch-up in this industry sector, however let's look at a similar scenario.
Let's say you and I agree that I'm going to pay you £300/day to do some job, whether administering a database or whatever. We agree the deal - that is you and I agree that it is fair to us both, and both agree to the terms as adults and able to make rational decisions. I'm not offering you sub-minimum wage, nothing illegal, just an agreement between adults. Now some mobsters come by me and tell me I have to use their DBA company, no choice, no options, and by the way it's £500/day, and if I use you they'll break your kneecaps and burn down my datacentre. You are cut out of the deal. Our agreement counts for nothing. Does that sound fine to you? Let's be clear, this ISN'T a safety issue, ISN'T in fact any other kind of issue other than sheer protectionism. By all means choose that world, and just hope you're on the right side of it or you will starve.