The programme is correct. Voices sound tinny and metallic. Like they're speaking through a can. Music has a harsh, ringing quality. Your reseller's audio compression is using a low quality codec that creates metallic artifacts.
A British IPTV reseller whose audio sounds metallic has a codec problem. The compression algorithm creates a ringing, metallic artifact. The reseller chose a low quality codec to save bandwidth. Your ears suffer.
The British IPTV services with natural audio use high quality codecs. Voices sound like voices. The reseller who used low quality codec makes everything sound like it's through a metal pipe.
The IPTV reseller panel includes audio codec selection. The reseller can choose high or low quality. Low quality saves bandwidth and creates metallic artifacts. The reseller's choice determines whether voices sound natural or tinny.
The IPTV reseller UK operators who listen to their streams would notice the metallic sound. They'd choose a better codec. The resellers who never listen don't know that voices sound like robots.
Here's a scenario that makes everyone sound artificial. You're watching a conversation. The voices have a metallic ring. They sound like they're coming through a tin can telephone. You can understand the words but they don't sound human.
Every voice has the same metallic quality. The reseller's low quality codec has made all audio sound processed and artificial.
I've tested audio codec quality across dozens of resellers. Most use codecs that sound natural. Some use low quality codecs with metallic artifacts. The reseller's codec choice determines whether voices sound natural or artificial.
A natural sounding British IPTV reseller will have audio without metallic artifacts. You can test this by listening to voices, especially familiar ones. If voices sound natural without a ringing or tinny quality, codec quality is good. If everything sounds metallic, the codec is too low quality.
The same principle applies to other compression artifacts like warbling or bubbling sounds. The careful reseller uses transparent codecs.
A natural voice British IPTV service will have audio that sounds like real people talking. Test by listening to dialogue. If voices sound natural and unprocessed, audio codec quality is good.