Rojo
A valid point "In my opinion spare machines and sensible staff (i.e. those who can think around a problem such as borrowing from else where) make on-call redundant." and would also ask what will the on-call technician be able to do as there are multiple technologies involved? Unless there are multiple on-call technicians, which would not be cost effective, then having on-call maybe classed as a wasteful resource. Just my opinion:)