The UK government tests emergency alerts on TV. Your panel either passes those tests or users see silence. There's no middle ground.
Here's the thing: UK broadcasters participate in the Emergency Alert System. A IPTV Reseller Panel that strips or modifies the signalling during transcoding will show a blank screen instead of the test message. For British IPTV users, this looks like your service failed during a national emergency drill.
I've watched a reseller's panel go silent during a national emergency alert test. Every British IPTV user saw a frozen screen. They flooded his support channels. The IPTV Reseller Panel had stripped the alert data.
What actually works is an IPTV Reseller Panel that passes through all public service signalling unchanged. A good British IPTV panel preserves RDS data, EAS tones, and embedded alert flags.
Real scenario: A British IPTV reseller asked his IPTV Reseller Panel provider: "What happens to emergency alert signalling when you transcode?" The provider sent a detailed document showing exactly which metadata was preserved. When the next test occurred, his users saw the alert exactly as intended.
That said, don't assume all panels handle this correctly. Many strip metadata aggressively. Ask specifically: "Do you preserve emergency alert signalling?"
Honestly, ask the provider: "Can you show me a recording of a UK emergency alert passing through your panel unmodified?" If they can't, assume their transcoding strips critical data.