To not want to pay playschool £5 because I have to work?

[mumfor1standmaybe2ndtime]

My employer has changed my work hours, I used to work 6am til 9am. I now have to work 7am til 11am when ds is at playschool or basically lose my job.
Now I am unable to be a parent helper at playschool and have to pay them £5 when I am on the rota. Am i being unreasonable to not want to pay it?

Why can't your child attend on the other 3 days, as you are entitled to 5x2.5 sessions a week?
The you could help on the other days?

I ma chair of a preschool, and we rarely have volunteers.
But we do use paid staff to cover all th ehours and children.

Or you could offer to take home all of the aprons, or tea towels.