Ignoring the apparent complication that the social tariff is because you qualify for it , but it’s your parents house ( so do they qualify in their own right or is some sort of subterfuge used to get the product for a non qualifying household ) , but Openreach can and do incentivise ISPs of all stripes to get their customers onto FTTP once it’s available, so in some respects the fact it’s BT and you have a cheap social tariff is irrelevant….someone refusing an upgrade to FTTP can have genuine reasons , like a renter is specifically told by their landlord that even minor work ( and FTTP installation is minor work ) needs the landlords specific permission which may not be given …..with regular tariffs , refusal to take FTTP could mean a more expensive out of contract price as renewal to get the cheaper price is dependent on taking FTTP, but as there is no difference in price , in or out of contract with the Essentials ( social tariff ) it may make no difference if you refuse, but the reason for your refusal is pretty weak sauce , and eventually you will have no choice but to take FTTP or be disconnected from Openreach ( although that may well be many years away ) , in my opinion you should bite the bullet and take the offer of FTTP , it’s more reliable , it delivers the headline speed , no distance related reductions in speed , and after all you will have to do it sometime, so why not now
