...so Picture Box Boost was removed today 30 June 2018. RIP PBB.
No notification by TalkTalk to me either by email, or in MyAccount or as a note on the TV screen or app display. If I hadn't been alerted by another member's post that it was going to happen and had noted that the Help page and Sales page content relating to Picture Box Boost had been deleted then I'd be left completely unaware.
Even Picture Box Films are still featuring TalkTalk as a provider.