You change picture mode on British IPTV. Your entire TV switches to a different preset. Your IPTV reseller's British IPTV panel uses HDMI-CEC to control your TV, and their IPTV panel doesn't limit changes to the app only. The pattern that keeps showing up across British IPTV HDMI-CEC complaints is this: an IPTV reseller using a cheap IPTV reseller panel has overly aggressive CEC control. A British IPTV reseller with a professional IPTV panel limits settings to the app or uses software-only processing. A real-world example: a user's British IPTV picture mode changed his TV's calibration. His IPTV reseller said "it's a feature." That said, ask your British IPTV seller: "Does picture mode change only the app or your entire TV?" A respectful IPTV reseller will say "app-only." Quick practical breakdown: a non-invasive IPTV panel uses software processing, not HDMI-CEC for picture modes. Test if picture mode affects other inputs during trial. In most cases, the British IPTV reseller whose picture mode stays in-app respects your TV; the one changing global settings doesn't. Honestly, a British IPTV app that messes with my TV calibration was unacceptable. The IPTV reseller's IPTV panel thought it owned my television.