A supply teachers pay is really determined by the employer, subject to any statutory regulation or agreements that may apply nationally/locally.

Therefore you could find daily/monthly rates vary a lot, especially when comparing different areas of the UK. Data from the NASUWT suggests the following pay scales:

The following tables illustrate the 2017/18 annual salary values and the daily rates that apply
to teachers in England and Wales who are paid on the highlighted min and max of the
pay ranges.

Please note- These daily rates are before deductions for tax and National Insurance:

England and Wales
(excluding London area)

Pay Scale  Annual Pay  Daily Pay
Min M1       £22,917       £117.53
M2               £24,728      £126.81
M3               £26,716       £137.01
M4               £28,772      £147.55
M5               £31,039      £159.18
M6               £33,824     £173.46
U1                £35,927      £184.25
U2               £37,258      £191.07
U3               £38,633      £198.12

Unqualified 1 £16,626 £85.27
Unqualified 2 £18,560 £95.18
Unqualified 3 £20,492 £105.09
Unqualified 4 £22,427 £115.01
Unqualified 5 £24,362 £124.94
Unqualified 6 £26,295 £134.85

Outer London Area

Pay Scale   Annual Pay    Daily Pay
M1                   £26,662              £136.73
M2                  £28,315              £145.21
M3                  £30,067              £154.19
M4                  £31,929              £163.74
M5                  £34,637              £177.63
M6                  £37,645              £193.06
U1                   £39,519              £202.67
U2                  £40,981              £210.16
U3                  £42,498              £217.94

Unqualified Outer London

Pay Scale   Annual Pay    Daily Pay
M1                    £19,749             £101.28
M2                   £21,684             £111.20
M3                   £23,618             £121.12
M4                   £25,555             £131.06
M5                   £27,487             £140.96
M6                   £29,422            £150.89

Working as Supply Through Agencies

There are no national pay and conditions for supply teachers employed by agencies.
Therefore, individual agencies are free to set their own pay and conditions levels against a
backdrop of general employment legislation. Agencies will charge each school a daily rate
when providing a teacher. However, the amount charged to the school will be greater than the
amount paid to the individual teacher undertaking the supply work.

It is wise to compare the rates paid to teachers that are offered by each agency.

Prior to undertaking an assignment with an agency, it is also important to confirm the payment policies of the agency and whether the teacher will be paid on an hourly, sessional, or daily rate basis. This is important because where a teacher is contracted on the basis of being paid on an hourly rate basis, they may not be paid for any time when they are not undertaking
teaching.

The Conduct of Employment Agencies and Employment Businesses Regulations 2003 sets
legal minimum standards for agency workers that must be adhered to by employment
agencies. This involves providing and agreeing information about pay, including when and how much a supply teacher will be paid.

Where an agency supply teacher has been working in the same role with the same
school/employer for at least 12 weeks, they have a right to be paid on the same basis as other
teachers employed by the school/employer. The amount the agency supply teacher will be
paid will depend on the pay policy of the employer. The teacher may request a copy of the pay
policy of the school/employer at any time.

Where the pay policy is unclear or is not provided upon request, members should contact the
NASUWT for advice.