Im thinking about the daughter here mate she has a static caravan she visits 2-3 weekends a month during season.
She has a 4G router with some old 10gb ( I know
) limit at £20 a month.
Talk Talk Home BB at £25 38-52 mb depending on time of the test.
Their light users no downloads just social media and a 3pm football every week. She could cancel both get something like this to cover caravan and home bb and save alot of cash. I carnt see how she looses out given most the time she only gets 38mb.
Reliability though was a worry. Seems you have no issues though.