Hello, my name is XXXXX XXXXX it is my pleasure to assist you with your question today. How long have you worked there for?
When a contract says you are guaranteed 20 hours a week then that is what you can expect on a weekly bases (Mon-Sun, unless a working week is defined differently in your contract). The employer cannot spread it out and average it over several weeks, for example 10 hours one week, then 30 the next.
As to overtime what does your contract say about it and your entitlement to overtime pay?
I am not sure. I would have to re-read my contract.
Additional hours are paid at normal rates.
Well if you are entitled to be paid overtime for any hours over the 20 you are guaranteed a week, then assuming you are required to do more than 20 in a single week, these should be paid as overtime and at the overtime rate
Do you need me to clarify anything further for you?
No I think that is all. Thank you very much for your help. It helps me in making my next step.
You are most welcome, all the best