As a residential customer you don't normally have a choice of service level. BT Retail has a blanket agreement as will others offering a voice or line service..
For Buinsess grade service it is possible with BT to have, Next Business Day, Next Day, 8 hour, 4 hour, 1 hour (onsite) and even a technician on site permanently during the working day or 24 hours/day. However, there is a cost to all of those.
The additional "benefits" that BT Retail provides to specific groups - seriously disabled, blind &c in the form of free Directory Enquiries, rapid response or enhanced repair times is paid for by BT Retail from their revenue stream and they pay Openreach for teh additional services.
If someone offers a cheap service, you need to ask, "What has been removed from or not available in the service offering?"
I don't think that we have lost more lines. Whenever there is a prolonged period of bad weather there will be damage to the network. The solution would be to have twice as many technicians ready and waiting for teh problems - but would you be prepared to pay 50% more for your line rental?
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