The real problem is BT-OR
This is all very well, but unless the handoff between the ISP and BT-OR is fixed nothing will change.
My village was blighted for two months by a dodgy linecard in the cabinet. More than half the properties had an outage at some point, and they all had a visit from BT-OR to check their cabling. I don't know how much these cost the ISP, but it was clear that OR were filling their boots instead of fixing an obvious common pattern (the faults from this cabinet had spiked by 1000s of percent). Many of us were unable to work from home, and had to travel to offices, even the vicar was offline from parish emails. But this was secondary to BT-OR being able to send out newly trained repair men and charge ISPs.
It's clear from BT Retail's advertising that this isn't going to change: if your broadband is offline they know it won't get promptly fixed, so they'll send out a 4G hotspot.