I think I’ll hold out and remain on the current set up until everything gets switched off, apparently I’ve heard that city fibre are working on solutions where there can still be digital and landline services for people in similar situation as mine. Not really prepared to pay out for the dialler upgrade as the upgrades are a national thing rather than a personal one.
They should have thought of this beforehand.
With respect I would suggest that this is only sensible if you use the time between now and end-2025 to plan how you are going to manage the transition, not just hold out and do nothing. While I would agree that there has been insufficient publicity about the switch-off, which is not helped by the fact that all the different CPs out there may take different approaches, it has been known since 2017 that this is going to happen. @jchamier's reference is dated 2021. It's all very well blaming "They", but you need to take some responsibility yourself. If you're not willing to upgrade your dialler if necessary, and it turns out for whatever reason not to be compatible with VoIP systems, then there's not much that CityFibre nor any other ISP will be able to do.
I would not rely on "urgency" to transfer folks to VoIP to force them to come up with a solution, especially if you reject the transition now. My guess is that, come the end of 2025, many folks are going to be left high and dry with kit that no longer works.
It's now too late to switch ISPs if you don't like the way TT are handling this. The PSTN stop-sell came into force on 5 September. Any ISP you switch to now will only be able to offer you a digital voice line of some kind.