You open your guide on your TV. The channel names are tiny. You have to squint. You stand up and walk closer to read. Your reseller's app has no font size adjustment. The text is too small for comfortable viewing.
A British IPTV reseller whose font size is too small has never tested on a TV. They designed the guide for a computer monitor. On a TV from normal viewing distance, the text is unreadable. The reseller never considered their customers' actual viewing conditions.
The British IPTV services with TV friendly design have large, readable text. You can see channel names from your couch. The reseller who ignored TV ergonomics makes you squint.
The IPTV reseller panel doesn't control font size. The reseller's app does. Choosing a tiny font for TV use is a design failure.
The IPTV reseller UK operators who watch from a couch would notice the tiny text. They'd increase font size. The resellers who only test at a desk don't know that you can't read the guide.
Here's a scenario that strains your eyes. You're sitting on your couch, 8 feet from the TV. You open the guide. The channel names are tiny. You squint. You lean forward. You still can't read some names. You have to stand up and walk closer to see what channel you're on.
Every time you use the guide, you strain your eyes. The reseller's tiny font has made a basic function physically uncomfortable.
I've tested font size across dozens of resellers. Most have TV friendly large text. Some have tiny computer monitor fonts. The reseller's design choices determine whether you can read the guide from your couch.
A TV friendly British IPTV reseller will have guide text that's readable from normal viewing distance. You can test this by sitting in your usual spot and opening the guide. If you can read channel names without squinting or leaning forward, font size is good. If you have to get closer, it's too small.
The same principle applies to EPG programme text. Some resellers have tiny programme descriptions. The careful reseller uses large, readable fonts everywhere.
A readable British IPTV service will have text you can see from your couch. Test by using the guide from your normal seating position. If you can read everything comfortably, the design is TV appropriate.