Archive.org is blocked by UK mobile providers. We need to go one layer deeper with a mirror of the archive of the paywall.

Not blocked here on 3. You’re right in that the networks often have the “adult content” filter (porn, gambling etc.) turned on, but you should be able to turn it off pretty easily. I suspect it’s that filtering that’s blocking archive.org for you

Yeah I am on Vodafone UK and it loads for me. I did specifically disable child filters though