Paying back

ICharger:
I have worked in a warehouse all week Monday to Friday 8am - 4.30pm.
Saturday I drove a lorry from 9am - 7pm so I reduced my rest.
So does this mean that I am unable to work this weekend and I still have to payback my rest.
If so then technically the Saturday I worked as overtime will get used as a day off in the week.
Confused! I am.

What did you do on the previous weekends leaning up to the Saturday when you drove :question:

Payback for last weekend must be paid back before midnight on Sunday 12th November