Hi Lisa,
On a contract of 20-25 hpw I would have a working supervisor, and if you need to cut back on cost,employ the supervisor for only an hour at the end of the shift so your cleaners will not be able to leave early and the supervisor could cover for cleaners whom are on holiday or didn't turn up . Also I find that giving the 'bits' work (staircase,sweeping entrance,brass etc.) to the supervisor means they are done and nobody can say this and that is not in my schedule.However make sure your working supervisor is smart as she would represent your business and deal with a certain amount of paperwork and also she must have common sense and attention to details.
The tricky part is to find THAT person!
Good luck
Regards,
Ildiko
Clean and Neat Service