Thanks for the information, I have looked into this and currently there is a known fault with various channel 4 programs which are showing error code 319, reference number F004772831. Estimated fix time is the 10th of October so if you do experience this again it's due to the fault. I would recommend setting up a series link for now just to make sure you're able to watch your programs.
Any further queries just let me know and i'll look into it for you.
Take care
