[keithpeter]

In the slightly stodgy public sector organisations I work in, using sessionally paid teaching staff to cover increased workloads is normal. If the workload increase becomes permanent, you can then advertise an established post. Seems prudent.

Perhaps as someone round here suggested some time ago, you should treat these companies as film projects. A group of freelancers get hired in to complete a project then when their work finishes they go on to the next project?