The Prime Minister's Office is an integral part of the Cabinet Office.
Permanent Cabinet Office employees are paid an annual salary, rather than an hourly rate. Permanent employees are paid within the Cabinet Office grading structure, where the grade of each role and the corresponding salary range is determined by the demands of the role.
Temporary Cabinet Office employees (on a fixed term contract of up to one year) are also paid an annual salary within the Cabinet Office pay ranges, with the grade again determined by the demands of the role.
As such, temporary and permanent employees at the same grade will both be paid within the same pay range.
Temporary staff not employed directly by the Cabinet Office (such as agency staff or fee-paid staff) are not Cabinet Office employees. Hourly rates of pay are not determined by the Cabinet Office and may be different than for temporary and permanent Cabinet Office employees.