Most of the budget broadband providers ( TT , Sky, VF) require you to take their line rental too, that way the ‘cheap’ broadband is in effect subsidised by the mark up on the line rental, of the company’s that still offer their own separate broadband while the customer continues to pay someone else for line rental ,I’m not sure they are necessarily at the cheaper end of the market as they don’t have the ‘extra’ income from paying around £7 a month wholesale line rental to a Openreach and then ‘chargng’ £18-£20 for it.
Do you have an ISP in mind ?, it may be worthwhile asking them if by taking their broadband it affects your entitlement to kept receiving BTB , I suspect it will.
TBH, BT Basic telephony is something Ofcom require BT and no one else to offer, and generally as it’s a social tariff, it’s aimed at those that could be priced out of basic telephony if they had to pay market rates, BT Basic broadband isn’t mandated by Ofcom , just BT’s voluntary offering ( what in effect is a social tarrif broadband service, albeit with a limited data allowance ) and as such I suspect if anyone wants to use a standard commercial broadband offering they would also have to use a commercial line rental, not continuing with the subsidy of BTB line rental.
