It's ADP. That's why Apple didn't reinstate ADP in the UK. The UK wants a backdoor for UK users of ADP.
And there are plenty of UK users of ADP - those who got in before it was banned still have it.
From the article:
> After the U.K. government first issued the TCN in January, Apple was forced to either create a backdoor or block its Advanced Data Protection feature
> the US claimed the U.K. withdrew the demand, but Apple did not re-enable Advanced Data Protection
> The new order provides insight into why: the U.K. was just rewriting it to only apply to British users
> The Financial Times reports that the U.K. is once again demanding that Apple create a backdoor into its encrypted backup services.
If you read further, or click the FT link, you'll see the UK is now demanding access to encrypted iPhone backups.
ADP is not relevant beyond the history; the UK is not doing anything with ADP but I understand the confusion if you don't know that "iPhone iCloud backup" is a separate service for iPhones.
And there are plenty of UK users of ADP - those who got in before it was banned still have it.
From the article:
> After the U.K. government first issued the TCN in January, Apple was forced to either create a backdoor or block its Advanced Data Protection feature
> the US claimed the U.K. withdrew the demand, but Apple did not re-enable Advanced Data Protection
> The new order provides insight into why: the U.K. was just rewriting it to only apply to British users