I think most providers will adjust the quality of what they download according to the speed and quality of the line you are on. So yon your line you might get an adequate SD-like experience but not 4K or HD. I think many of them do a free trial (I know Britbox does) so best to try before you buy... Of course just ordinary YouTubes would give you some feeling for how good it's likely to be.
Also your device can make a difference. I am on a 200mb connection but even with that the newer 4K Firestick works a lot better than the previous version - presumably because it has a more powerful processor and probably more memory.
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