I had a look at the new retail Humax s/w 18.3.0 this morning.
It appears that if you install this software it defaults you to sharing your personal data with Youview's content providers.
There is the ability to Not Share - this is found under Settings > Your Info & Legal > Personal Data.
Its a bit naughty to default it to Share.
I'll feed that back.
For info, newly installed boxes will get a screen asking to opt-in or opt-out.