You hear dialogue perfectly. Music sounds great. Then you switch to a different channel. No sound at all. Your British IPTV provider is using audio codecs that some devices don't support. When your device can't decode, you get silence.
A British IPTV provider who uses AC3 or EAC3 audio is choosing quality over compatibility. Those codecs sound better. They also fail on many devices. The reseller who uses AAC works everywhere. The reseller's choice determines whether you hear silence.
The British IPTV reseller who tests on real devices would know which codecs work. They'd choose compatible codecs over high quality ones. The reseller who doesn't test leaves you guessing why some channels have no audio.
The IPTV reseller UK operators who serve a broad audience use AAC. It works on everything. The resellers who use AC3 are prioritising audio quality for the minority of devices that support it.
The IPTV reseller panel includes audio codec selection. The reseller can choose AAC for compatibility or AC3 for quality. Their choice determines whether your family can hear all channels.
Here's a scenario that creates confusion. You're watching a channel. Audio works. You switch to a movie channel. No sound. You restart your device. Still no sound. You try different apps. Nothing. The channel uses AC3 audio that your TV doesn't support. The reseller never warned you.
You have to avoid that channel forever. The reseller's codec choice has made some channels unusable for you.
A codec compatible British IPTV reseller will have audio that works on your device. You can test this by playing several different channels, especially movie channels that might use AC3. If all have audio, codec compatibility is good. If some are silent, the reseller is using codecs your device doesn't support.
The same principle applies to audio channels. Some resellers use 5.1 audio that stereo devices can't decode. The careful reseller provides a compatible downmix.
A universally compatible British IPTV service will have audio on every channel. Test by playing a variety of channels. If you never encounter silence, codec choice is good.