A channel loads in 2 seconds. Then it buffers. Then it drops entirely. Your customer doesn't care why.
Here's a contrarian opinion. Most British IPTV complaints aren't about the feed itself. They're about the route between your IPTV Reseller Panel and the end user's living room. Different problem entirely.
I ran a test last month. Same British IPTV source, two different IPTV Reseller Panel providers. Panel A delivered stable 1080p throughout a Manchester derby. Panel B stuttered every 90 seconds. Same source, same city, same ISP. The difference was how each panel handled congestion.
What most operators find is that a quality IPTV Reseller Panel maintains at least 20% overhead bandwidth specifically for British IPTV peak hours. Cheaper panels oversell their pipe. You feel that as buffering. Your customers feel it as frustration.
One reseller I know switched panels after losing 40 customers in a single week. His old IPTV Reseller Panel couldn't handle the Saturday 3 PM blackout window. New panel? Zero complaints in three months. Same British IPTV channels. Different backend.
That said, you don't need the most expensive panel. You need one that publishes real-time server load stats. If they hide that data, they're hiding something else.
The honest truth? Test three panels simultaneously during a major UK sporting event. Only one will survive. That's your answer.