It’s an absolute joke that you are on a zero hour contract for a vital and regular service such as dinner lady (/person).
As per the Gov.uk website:
“Appropriate use
Zero hours contracts are useful where work demands are irregular or where there is not a constant demand for staff. Zero hours contracts can also provide a level of flexibility for the individual, which allows them to work around other commitments such as study or childcare.”
And :
“Inappropriate use
Zero hours contracts allow flexibility for both employers and individuals. However, they should not be considered as an alternative to proper business planning and should not be used as a permanent arrangement if it is not justifiable.
Zero hours contracts might not be appropriate if the job offered will mean the individual will work regular hours over a continuous period of time.”
Please remember - you have minimum employment rights, no guarantee of work, they can drop you at a moments notice, you are unlikely to receive the same perks and benefits of a perm/temp employee.
One of the very few benefits of being on a zero hour contract is the supposed two way flexibility to suit both needs see above re childcare.
There is supposed to be more guidance from the government this year in relation to employers giving more notice to change of hours to employees etc I believe.
I don’t want to give HR advice re this as I’m not qualified but please seek advice from ACAS or CAB and send a very strongly worded email to this boss and their senior do there is a paper trail reminding them of the zero contract arrangement.
If they want more regularity and flexibility from you then they should do the right thing and change your contract to a more suitable one which gives you the added benefits and employment rights that everyone in this country should expect at the least!
Zero hour contracts may have a small place in society I believe - but for the provision of food to school kids??? Absolute joke! I’m angry on your behalf OP!