Most British IPTV streams use basic encryption that ISPs can detect. Some use obfuscation that hides the traffic type.
Here's the technical difference. A British IPTV reseller delivering unencrypted streams makes it easy for ISPs to identify and throttle video traffic. Obfuscated streams look like regular HTTPS web traffic.
What actually works for avoiding ISP blocking is choosing resellers who use obfuscation or CDN delivery. These methods make your British IPTV traffic indistinguishable from normal web browsing.
I tested two British IPTV services on the same ISP. One got throttled to 2 Mbps every evening. The other maintained 25 Mbps. The difference was obfuscation technology that the second reseller paid extra for.
The pattern that keeps showing up is that IPTV reseller UK operators who understand modern streaming protocols invest in delivery optimization. Those who just resell raw source feeds get blocked and throttled constantly.
Honestly, ask your IPTV reseller UK if they use obfuscation or CDN delivery. If they don't know what you're talking about, they're using basic streams that ISPs can detect. If they explain their setup confidently, they're technically competent.
That said, no encryption method is perfect. ISPs evolve their detection. Resellers who adapt stay ahead.
In most cases, resellers who charge slightly more invest in these delivery technologies. The £30 annual service almost certainly isn't.