BoxSets OnDemand do "come and go" from time to time, but any OnDemand programme that's due to soon expire has an onscreen warning from a couple of weeks prior, that says "available until xyz date".
I agree that Mad Dogs S4 is indeed currently unavailable.
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Welcome to the community and thanks for taking the time to post your issue on the forums. I'm sorry that series 4 of Mad dogs isn't available at the moment, I will get this raised with the team now and update you as soon as I have anything back from them.