I did originally complain to BT and they sent out an engineer. He thought my speed was quite astonishing compared to how far from the cabinet I am. 'He said'... he had installed FTTC for others( in different areas)about as far from the cabinet as me who couldn't get a usable speed.
Which is fair enough. The estimate was very wrong, and at point you could no doubt have cancelled because of it. But understandably, you wouldn't want to.
Similarly, if you order online from PlusNet and it shows that 24Mbps figure during the process, that will be junk in the BT Wholesale database. Your connection speed will be as now.
Note
this Quidco page. Cashback occasionally fails, but costs you nothing even if it does. The Fibre one is the £20

, and line rental has to be added to those figures which are for the FTTC only. TopCashBack give £39.90, so that looks better, assuming the £12.99 for 9 months on PlusNet's site applies if you go that way.
My broadband basic info/help site - www.robertos.me.uk |
Domains,website and mail hosting - Tsohost.
Connection - Plusnet UnLim Fibre (FTTC). Sync ~ 55.8/14.5Mbps @ 600m. -
BQM
"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
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Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.