Senior Office Administrator

Looking for an experienced Senior Office Administrator who is a whizz in the office.   Key responsibilities include managing the day to day runnings of a small but busy office in the trade industry. Typing, answering emails, organising documents answering phones and customer enquiries, scheduling staff, collecting information for payroll team and general day-to-day office duties as required by the director.
Must be competent in Microsoft applications on a Mac, have an eye for detail and know how to organise an office so that it runs smoothly.
Flexible working hours to be negotiated. Approximately 20 hours per week