Thanks for getting in touch with us.
As you mentioned, YouView NOW TV content can only be offered as SD currently. There are no current plans to develop this but it may be something that's explored in future.
I do understand this may not be the ideal method of viewing content for your needs. You may find one of our other supported devices suit this better.
I apologise for any inconvenience it's caused you.
NOW TV Team
Worth noting @joseph71 that the Sky Store app is being removed from YouView on November 30th.