1 SD Apple TV and 1HD Apple TV  iTunes conflict

I have two apple tv's one connect to standard broadband so I have set this to SD video quality. The other is on fibre and set to HD.
The problem I have is I forget that the SD one is SD and when I buy content on it , it is SD.
Is there a way to set the default purchase quality to HD on my iTunes account ?
I believe I can not upgrade purchases to HD if I bought the SD and I don't want to spend another 30 pounds on supernatural.
Cheers

Welcome to the Apple Community.
Yes you can do that, you just can't mirror the entire screen.

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