"If you’ve been trying to track down a Freesat recording box lately"

I don't understand this. I use "16:9" screen settings on the TV, as opposed to "Screen Fit" AKA "1:1" or "Pixel" (etc), which is the modern equivalent of overscan. Overscan was a technique in analogue broadcasting and CRT TVs to clean up the left and right edges of the picture (which would be ragged) and avoid displaying the non-picture frame lines at the top and bottom (they got used for Teletext data).

It used to be the case, although I haven't checked lately, that even with digital broadcasting the left and right edges were badly defined. On something like BBC Breakfast, which switches between multiple video sources, displaying it 1:1 resulted in the picture width jumping (but within the old overscan margin). Having the screen set to 16:9 (ie only displaying the non-overscan central area, with a few percent missing beyond the edges of the physical screen) avoids that width variation.

I have not noticed any captions going missing. Is that on start-up services that might not understand the broadcasting etiquette by any chance? They really should keep the critical content within the non-overscan area.

The screen 1:1 setting is for display use rather than broadcast TV, by which I mean as a computer monitor or perhaps DVD/Blu-ray.
 
I blame the BBC for not transmitting the Test Card any more.:geek:
I haven't got a TV that allows me to fiddle with the picture size to get it how I want it. That, and the missing Test Card, means I have to put up with bits cut off all over the place. Having said that, some channels - yes you Sky News - don't broadcast the whole picture on Freeview anyway.
(The following quote was posted as I was writing- so apologies if I've duplicated something)
I have not noticed any captions going missing. Is that on start-up services that might not understand the broadcasting etiquette by any chance? They really should keep the critical content within the non-overscan area.
The right hand edge of text on the strap often goes missing on Sky News.
 
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