I can't see it online either so it might be worth asking Sky Store support to see if they know if it will be available to rent online. They have a live chat you can use that is available from 11am-7.30pm Monday to Saturday and can be found here:
https://www.skystore.com/help/contact-us
If it does become available then do note that you will only be able to watch it online as you will be unable to send it to a Sky box.
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