@Mullane1
All you need to do is to delete the UHD version and delete it again from the deleted folder then you can rent the HD version. As you haven't started to play it then usually you shouldn't be charged for it but if you do see a charge you can use a live chat here to get in touch with Sky between 11am and 7.30pm Monday to Saturday:
https://www.skystore.com/help/contact-us
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