Will you be in the same school for some time or do you work wherever?
I work supply 2 days a week in Aberdeen and I know that if you are working for extended periods (months and it is expected to continue) you get sick pay so I wonder if you are able to get maternity pay too.
I had assumed that I would get nothing from the council at all for maternity leave as I work in various schools and so I think I only get maternity benefits for my 3 day permanent job. Assuming you are working regularly you are at least entitled to maternity allowance (I think).
Here's some stuff from
www.direct.gov.uk that may help.
Maternity Allowance
If you can't get SMP from your employer, you might get Maternity Allowance (MA) if you:
* are employed
* are self-employed and pay Class 2 National Insurance contributions or
* have a Small Earnings Exception certificate
* are not employed but have worked close to or during your pregnancy
The conditions are that you:
* worked (either on an employed or self employed basis) for at least 26 of the 66 weeks before the week your baby was due (a part week counts as a full week).
* earned an average of £30 over any 13 of those 66 weeks
The standard rate of MA is £112.75 or 90 per cent of your average weekly earnings, whichever is less. If your expected week of childbirth begins on or after 1 April 2007, it is paid for up to 39 weeks. If your expected week of childbirth was earlier than this then it is paid for up to 26 weeks. MA is not liable to income tax or NI contributions.
I hope this is helpful