The future dates BT provide are ALWAYS only ever estimates. They might get halfway through work and discover it'll take longer.
Particularly now with the aggressive FTTC rollout taking place, 21cn conversions might have taken a back burner in some locations.
Sadly the only people who can absolutely confirm or deny this are BT Wholesale. Keep an eye out, start to get concerned if you hit November and nothing's happened
Was on Xilo C&W LLU on MRCEN, Now Be* on MRARD.