Re: I would make the move...
Do you need the speeds, or do you need the stability??
If your area offers FTTP, Aquiss are doing a package capped at 80/20 Mbps for almost the same as their FTTC package.
yes, I read that you are getting it through work, but as written, it implies you are having to wait, possibly for quite a while, for work to get around to arranging it.
TBH, I get around 50/15Mbps on my uber-cheap backup mobile connection; if 5G fixes 4G's latency issues, I may well drop my landline entirely.
Biting the hand that feeds IT
