IR35
I have friends who do temporary work in the NHS, eg a few months pregnancy cover. They were one of the first to be hit by IR35; things like not being able to reclaim travel and accommodation when working at a hospital too far from home for a daily commute. The result is that they are more pickey at what gigs they will accept and are moving away from the NHS.
I suppose that the real problem is that these temporary workers are not donors to the Tory party.